JPH10236992A - Liquid crystal compound having negative anisotropic value of dielectric constant, liquid crystal composition containing the same and liquid crystal display element using the composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low-viscosity liquid crystal compound suitable for a liquid crystal display element, excellent in negative anisotropic value of dielectric constant, optical anisotropy, voltage retention, stability and compatibility, containing a specific structure in a skeleton structure. SOLUTION: This liquid crystal compound containing a structure of formula I [G is a 1-6C alkylene, O, S, Se, a (1-10 alkyl-substituted)imino, etc.] such as a 3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene-2,7-diyl group in a skeleton structure is shown by formula II [R<1> and Y<1> are each a 1-20C alkyl, H, a halogen, cyano, etc.; X<1> to X<4> are each a signal bond, (CH2 )2 , CH=CH, C≡C, COO, etc.; rings A<1> to A<5> are each a group of formula I, trans-cyclohexane-1,4-diyl, 1,4-phenylene, etc.; a<1> to a<5> are each 0 or 1; a<1> +a<2> +a<3> +a<4> +a<5> >=1].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a liquid crystal display device, for example, a vertical alignment system, IPS = in-plane switching, TFT = thin film transistor, TN = twisted nematic, or STN = super twisted nematic, etc., and especially vertical alignment. TECHNICAL FIELD The present invention relates to a novel liquid crystal compound capable of exhibiting various physical properties suitable for a liquid crystal composition for a system and an IPS, a liquid crystal composition having suitable physical properties using the same, and a liquid crystal display device using the liquid crystal composition. In the present application, the term “liquid crystalline compound” is used as a general term for a compound that exhibits a liquid crystal phase and a compound that does not exhibit a liquid crystal phase but is useful as a component of a liquid crystal composition.

[0002]

BACKGROUND ART Conventionally, various liquid crystal display systems have been proposed. As an example of them, the following display method is mentioned (Latest technology of liquid crystal, edited by the Industrial Research Council (1983)). As a method of using a liquid crystal composition having a positive dielectric anisotropy value, T
There is a method such as AM = active matrix (TFT or MIM = metal, insulating film, metal, etc.) based on N, STN, or TN. As a method of using a liquid crystal composition having a negative dielectric anisotropy value, ECB = electric field control birefringence effect (HAN = hybrid molecular arrangement or DAP = vertical molecular arrangement, etc.), DS = dynamic scattering, GH = There are methods such as guest host or PC = phase transition. Of these systems, the mainstream of those currently in practical use is a system using a liquid crystal composition having a positive dielectric anisotropy value. Compared to this, practical use of the method using a liquid crystal composition having a negative dielectric anisotropy value has been delayed. In connection with this,
The development of liquid crystal compositions with a negative dielectric anisotropy value and the compounds used for the same are not enough compared to the development of liquid crystal compositions with a positive dielectric anisotropy value and the compounds used for the same. is there.

Under these circumstances, recently, attempts to improve the narrow viewing angle, which is one of the drawbacks of the liquid crystal display, have been actively made. One of the methods is
IPS (R. Kiefer et al, JAPAN DISPLAY'92,547
(1992), M. Oh-e et al, ASIADISPLAY '95, 577 (1995), JP-T5-505247, JP-A-7-128647.
No.). One of the features of the IPS is that, in the conventional liquid crystal panel, electrodes are provided on upper and lower substrates, respectively, whereas in the liquid crystal panel of this system, interdigital electrodes are provided only on one substrate. It is. Another feature of this method is that the liquid crystal composition can be used regardless of the positive or negative value of the dielectric anisotropy value. As another example of an attempt to improve the narrow viewing angle, there is a method in which the vertical angle of liquid crystal molecules is used to improve the viewing angle (Japanese Patent Laid-Open No. 2-176625). One of the features of this method is that a liquid crystal composition having a negative dielectric anisotropy is used. From such a background, liquid crystal compounds and liquid crystal compositions having a negative dielectric anisotropy value have been strongly demanded.

In all display systems, the liquid crystal composition used has not only an appropriate dielectric anisotropy value but also other characteristics such as a refractive index anisotropy value (△ n) and an elastic constant ratio K. _It is necessary to adjust various physical property values such as ₃₃ / K ₁₁ (K ₃₃ : bend elastic constant, K ₁₁ : splay elastic constant) to an optimum value, and that the liquid crystal phase is in an appropriate temperature range In addition, low viscosity is required even at a low temperature. None of the conventionally known liquid crystalline compounds satisfy all of these conditions alone. Therefore, in order to obtain a composition that can be usually used as a liquid crystal phase, it is prepared by mixing a compound having several to twenty and several kinds of liquid crystal phases and, if necessary, a compound having no more than several kinds of liquid crystal phases. . Therefore, each liquid crystal compound is
Characteristics such as good compatibility with other liquid crystal compounds and good compatibility in a low temperature range are also required due to demand for use in a low temperature environment.

However, as described above, the conventional display system mainly uses a liquid crystal composition containing a liquid crystal compound having a positive dielectric anisotropy value. However, the development of the compound or composition was not sufficient. For this reason, the method of diversification in this way and the corresponding various characteristics have been insufficient. For example, even if the dielectric anisotropy value is negative, the absolute value is small, the driving voltage cannot be reduced due to the large elastic constant, the compatibility is poor, and the compound cannot be used in large quantities. It is difficult to freely set the value of the refractive index anisotropy, there is a problem that the viscosity is large, and the chemical and physical stability is poor.

Prior to the present invention, a liquid crystalline compound having a 9,10-dihydrophenanthrene skeleton has already been reported (JP-A-57-81441). However, the compounds disclosed herein have, for example, appropriate dielectric anisotropy values and refractive index anisotropy values, small elastic constants, good compatibility, low viscosity, high chemical and physical stability, and the like. The physical property values required for using this compound in a liquid crystal composition are not always satisfactory, and there is no negative dielectric anisotropy having a particularly large absolute value, and further improvement has been demanded. In addition, there is no idea here for inducing a compound having a 9,10-dihydrophenanthrene skeleton into a liquid crystal compound having a negative dielectric anisotropy value. In particular, compounds in which the hydrogen at the 3,4,5,6-position has been substituted by fluorine have not been known so far. Thus, the compounds of the present invention are not readily conceivable from the prior art.

[0007]

An object of the present invention is to provide a vertical alignment system, IPS, ECB (HAN or DAP, etc.) as described in JP-A-2-176625,
Not only can it be used for various display methods using compounds or compositions having a negative dielectric anisotropy value such as S, GH or PC, but also TN, STN, or TN-based AM (TF
T or MIM), which solves the above-mentioned problem that can be used for adjusting various characteristics of a liquid crystal composition for various display systems using a compound or a composition having a positive dielectric anisotropy value. It is an object of the present invention to provide a novel liquid crystal compound, a liquid crystal composition containing the same, and a liquid crystal display device prepared using the liquid crystal composition.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. ,
A compound having an appropriate refractive index anisotropy value, a small elastic constant, good compatibility, low viscosity, high chemical and physical stability, and a compound according to any one of claims 1 to 4. By using in a product, a liquid crystal composition having a small elastic constant, appropriate setting of dielectric anisotropy value and refractive index anisotropy value, low viscosity, and excellent chemical and physical stability, In particular, they have found that a liquid crystal composition having a large absolute value and a negative dielectric anisotropy value can be obtained, and that a liquid crystal display device can be obtained by using the composition, thereby completing the present invention.

That is, the present invention provides the following [1] to [1]
4]. [1] A liquid crystalline compound having a skeleton structure represented by the general formula (1).

[0010]

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Wherein G represents an alkylene group having 1 to 6 carbon atoms, an imino group in which an oxygen atom, a sulfur atom, a selenium atom, and a hydrogen atom may be substituted by an alkyl group having 1 to 10 carbon atoms; The above hydrogen atom represents a silylene group which may be substituted with an alkyl group having 1 to 10 carbon atoms, or -SO-, wherein one or more non-adjacent methylene groups in the alkylene group are an oxygen atom, sulfur Atom, selenium atom, nitrogen atom, -C≡C-, one or more hydrogen atoms having 1 to 10 carbon atoms
May be substituted with a silylene group or a vinylene group which may be substituted with an alkyl group, and each atom constituting the compound may be substituted with its isotope. )

[2] When the structure represented by the general formula (1) is 3,
The liquid crystal compound according to item [1], which is a 4,5,6-tetrafluoro-9,10-dihydrophenanthrene-2,7-diyl group. [3] General formula (2)

[0013]

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(In the formula (2), R ¹ and Y ¹ each independently represent an alkyl group having 1 to 20 carbon atoms, a hydrogen atom, a halogen atom, a cyano group, a cyanate group, an isocyano group or an isothiocyanate group. Wherein at least one non-adjacent methylene group in the alkyl group is an oxygen atom, a sulfur atom, a nitrogen atom, -C≡C-, and at least one hydrogen atom has 1 to 10 carbon atoms.
May be substituted with a silylene group which may be substituted with an alkyl group, or a vinylene group, and one or more hydrogen atoms in these alkyl groups may be substituted with a fluorine atom or a chlorine atom. And these alkyl groups may be optically active, and X ¹ , X ² , X ³ and X ⁴ each independently represent a single bond, — (CH ₂ ) ₂ —, —CH ＝ CH—, —C ≡
C -, - COO -, - OCO -, - CH 2 O -, - OC
H ₂ —, — (CH ₂ ) ₄ —, — (CH ₂ ) ₃ O—, —O (C
_{H 2) 3 -, - CH} = CHCH 2 CH 2 -, - CH 2 CH =
CHCH ₂ —, —CH ₂ CH ₂ CHＣＨCH—, —CH ＝ C
_{HCH = CH -, - CF 2} O -, - OCF 2 -, - CH =
_{CHCH 2 O -, - OCH 2} CH = CH -, - CF = CF
_{-, - CH 2 CF 2 -} , - CF 2 CH 2 -, - (CF 2)
_{2 -, - (CF 2)} 4 -, - (CH 2) 2 COO -, - OC
_{O (CH 2) 2 -,} - CH = CHCOO -, - OCOCH
= CH-, -CH = CHC≡C- or -C≡CCH = C
H-, ring A ¹ , ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ are each independently cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-diyl, , 4-phenylene, bicyclo [1.1.1] pentane-1,3-diyl, or a group represented by the following general formula (1), and these ring A ¹ , ring A ² , ring A ³ , At least one of A ⁴ and ring A ⁵ is a group represented by the general formula (1), and a carbon atom constituting these rings may be substituted with a nitrogen atom, an oxygen atom or a sulfur atom, A hydrogen atom on the ring may be substituted with a halogen atom or a cyano group, and these rings may be optically active;

[0015]

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(In the formula (1), G represents an alkylene group having 1 to 6 carbon atoms, an imino group in which an oxygen atom, a sulfur atom, a selenium atom, and a hydrogen atom may be substituted by an alkyl group having 1 to 10 carbon atoms.) A silylene group in which one or more hydrogen atoms may be substituted by an alkyl group having 1 to 10 carbon atoms, or -SO-
Wherein one or more non-adjacent methylene groups in the alkylene group are an oxygen atom, a sulfur atom, a selenium atom, a nitrogen atom, -C≡C-, and one or more hydrogen atoms have 1 to 1 carbon atoms.
It may be substituted with a silylene group which may be substituted with an alkyl group of 0 or a vinylene group. ), A ¹ , a ² ,
a ^3, a ⁴ and a ⁵ are each independently represent 0 or 1, a ¹
+ A ² + a ³ + a ⁴ + a ⁵ ≧ 1 and each atom constituting the compound may be substituted with its isotope. The liquid crystalline compound according to item [1], which is represented by the formula (1).

[4] General formula (2)

[0018]

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(Wherein R ¹ and Y ¹ each independently represent an alkyl group having 1 to 20 carbon atoms, a hydrogen atom, a halogen atom, a cyano group, a cyanate group, an isocyano group or an isothiocyanate group; One or more non-adjacent methylene groups in the alkyl group may be an oxygen atom, a sulfur atom, a nitrogen atom,
C- One or more hydrogen atoms may be substituted with a silylene group which may be substituted with an alkyl group having 1 to 10 carbon atoms, or a vinylene group;
One or more hydrogen atoms may be substituted with a fluorine atom or a chlorine atom, and these alkyl groups may be optically active, and X ¹ , X ² , X ³ and X ⁴ each independently represent a single atom. _{bond, - (CH 2) 2 -} , - CH = CH -, - C≡C -, -
COO -, - OCO -, - CH 2 O -, - OCH 2 -, -
_{(CH 2) 4 -, -} (CH 2) 3 O -, - O (CH 2) 3 -,
_{-CH = CHCH 2 CH 2 -,} - CH 2 CH = CHCH
_{2 -, - CH 2 CH 2} CH = CH -, - CH = CHCH =
_{CH -, - CF 2 O -} , - OCF 2 -, - CH = CHCH
_{2 O -, - OCH 2 CH} = CH -, - CF = CF -, - C
_{H 2 CF 2 -, - CF} 2 CH 2 -, - (CF 2) 2 -, - (C
_{F 2) 4 -, - (} CH 2) 2 COO -, - OCO (CH 2) 2
-, -CH = CHCOO-, -OCOCH = CH-,-
CH = CHC≡C— or —C≡CCH ＝ CH—,
Ring A ¹ , ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ are each independently trans-cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-diyl, 1,4- Phenylene, bicyclo [1.1.1] pentane-1,3-diyl, or 3,4,5,6-tetrafluoro-9,10-
Dihydrophenanthrene-2,7-diyl, wherein at least one of ring A ¹ , ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ is 3,4,5,6-tetrafluoro-9, 10-
Dihydrophenanthrene-2,7-diyl, wherein carbon atoms constituting these rings may be substituted by nitrogen atoms, oxygen atoms or sulfur atoms, and hydrogen atoms on the rings are substituted by halogen atoms or cyano groups. And these rings may be optically active; a ¹ , a ² , a ³ , a ⁴
And a is ⁵ represents 0 or 1 each independently, a ¹ + a ² +
a ³ + a ⁴ + a ⁵ ≧ 1 and each atom constituting the compound may be substituted with its isotope. The liquid crystalline compound according to item [1], which is represented by the formula (1).

[5] A liquid crystal composition comprising at least two components, comprising at least one kind of the liquid crystal compound according to any one of [1] to [4]. [6] As a first component, at least one compound according to any one of the items [1] to [4] is contained, and as a second component, general formulas (3), (4) and (5) A) a liquid crystal composition comprising at least one compound selected from the group consisting of:

[0021]

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(Wherein R ² represents an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group may be substituted with an oxygen atom or —CHＣＨCH—). And one or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, and Y ² represents a fluorine atom, a chlorine atom, —OCF ₃ , —OCF ₂ H, —C
_{F 3, -CF 2 H, -CFH} 2, -OCF 2 CF 2 H or -
Represents OCF ₂ CFHCF _3, L ¹ and L ² represents a hydrogen atom or a fluorine atom each independently, Z ¹ and Z ² are each independently _{- (CH 2) 2 -,} - (CH 2) 4 - , -COO-,-
CF ₂ O—, —OCF ₂ —, —CH ＝ CH— or a single bond, and ring Q ¹ is trans-cyclohexane-1,4-diyl, 1,3-dioxane-2,5-diyl, or a hydrogen atom Represents 1,4-phenylene which may be substituted by a fluorine atom, and ring Q ² is trans-cyclohexane-
1,4-diyl or 1,4-phenylene in which a hydrogen atom may be substituted with a fluorine atom, and atoms constituting these compounds may be substituted with an isotope thereof. )

[7] As the first component, [1] to [1]
[4] contains at least one kind of the compound according to any one of the items, and contains, as the second component, at least one kind of a compound selected from the compound group consisting of the general formulas (6) and (7). A liquid crystal composition characterized by the following.

[0024]

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(Wherein R ³ and R ⁴ each independently represent an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group are an oxygen atom or —CH ＝
May be substituted with CH-, one or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, and Y ³ represents a cyano group or -C 環 C-CN; Q ³ is trans-cyclohexane-1,4-diyl,
Represents 1,4-phenylene, 1,3-dioxane-2,5-diyl or pyrimidine-2,5-diyl, and ring Q ⁴ is trans-cyclohexane-1,4-diyl, pyrimidine-2,5-diyl, Or 1,4-phenylene in which a hydrogen atom may be substituted by a fluorine atom, and ring Q ⁵ is trans-cyclohexane-1,4-diyl or 1,4
Represents phenylene, and Z ³ represents — (CH ₂ ) ₂ —, —COO
Or represents a single bond, L ³ , L ⁴ and L ⁵ each independently represent a hydrogen atom or a fluorine atom, b, c and d each independently represent 0 or 1, and these compounds The constituent atoms may be substituted by their isotopes. )

[8] As the first component, [1] to
[4] The compound according to any one of items [1] to [4], wherein at least one of the compounds according to any one of [4] to [11] is contained.
And at least one compound selected from the compound group consisting of (5) and at least one compound selected from the compound group consisting of general formulas (8), (9) and (10) as a third component. A liquid crystal composition characterized by containing various types.

[0027]

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(In the formula, R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group are an oxygen atom or —CH ＝
CH-, one or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, and ring Q ⁶ , ring Q ⁷ and ring Q ⁸ are each independently , Trans-cyclohexane-1,4-diyl, pyrimidine-
Represents 2,5-diyl or 1,4-phenylene in which a hydrogen atom may be substituted by a fluorine atom, and Z ⁴ and Z ⁵ each independently represent -C≡C-, -COO-,-( CH ₂ ) ₂
Represents-, -CH = CH- or a single bond, and atoms constituting these compounds may be substituted with an isotope thereof. )

[0029]

[9] As the first component, the first [1] to
[4] It contains at least one kind of the compound according to any one of the items [4] and as a second component, the compound represented by the general formula (11) or (1).
A liquid crystal composition comprising at least one compound selected from the group consisting of compounds (2) and (13).

[0030]

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(Wherein, R ⁷ and R ⁸ each independently represent an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group are an oxygen atom or —CH ＝
CH-, one or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, and ring Q ⁹ and ring Q ¹⁰ are each independently trans-
Represents cyclohexane-1,4-diyl or 1,4-phenylene, it represents an L ⁶ and L ⁷ each independently represent a hydrogen atom or a fluorine atom not represent simultaneously hydrogen atoms, Z ⁶
And Z ⁷ are each independently — (CH ₂ ) ₂ —, —COO—
Or a single bond, and the atoms constituting these compounds may be substituted with isotopes thereof. )

[10] As the first component, [1] to
[4] The compound according to any one of the items [1] to [4], wherein at least one compound is contained as the second component, and
And at least one compound selected from the compound group consisting of (10) and at least a compound selected from the compound group consisting of the general formulas (11), (12) and (13) as the third component. A liquid crystal composition comprising one type. [11] As a first component, at least one compound according to any one of the items [1] to [4] is contained, and as a second component, the compound comprises the general formulas (6) and (7). Containing at least one compound selected from the group of compounds,
As the third component, the above general formulas (8), (9) and (1)
A liquid crystal composition comprising at least one compound selected from the group consisting of 0).

[12] As the first component, [1] to [1]
[4] The compound according to any one of items [1] to [4], wherein at least one of the compounds according to any one of [4] to [11] is contained.
And at least one compound selected from the compound group consisting of (5) and at least one compound selected from the compound group consisting of the general formulas (6) and (7) as the third component. A liquid crystal composition comprising, as a fourth component, at least one compound selected from the compound group consisting of the general formulas (8), (9) and (10). [13] A liquid crystal composition, which further comprises one or more optically active compounds in addition to the liquid crystal composition according to any one of [5] to [12]. [14] A liquid crystal display device including the liquid crystal composition according to any one of the items [5] to [13].

No.

The inventions of [9] and [10]
The invention relates to a liquid crystal composition of a type (Δε is negative). The N-type liquid crystal composition can be driven by various display methods such as a vertical alignment method described in JP-A-2-176625 and IPS. In addition, [6], [7],
The inventions described in the paragraphs [8], [11] and [12] relate to a P-type (positive Δε) liquid crystal composition.
An N-type compound can also be used as a component of the liquid crystal composition. This not only allows the dielectric anisotropy value to be freely set according to the intended use of the liquid crystal composition, but also
Other characteristics, such as control of the refractive index anisotropy value and elastic constant of the liquid crystal composition, are also possible.

Preferred embodiments of the compound of the present invention having a structure represented by the above formula (1) in the skeleton structure are shown below. In the compound of the present invention having a structure represented by the general formula (1) in the skeleton structure, G represents an alkylene group having 1 to 6 carbon atoms, an oxygen atom, a sulfur atom, a selenium atom, and a hydrogen atom having 1 to 10 carbon atoms. An imino group optionally substituted with an alkyl group, a silylene group optionally having one or more hydrogen atoms substituted with an alkyl group having 1 to 10 carbon atoms, or -SO-
Wherein one or more non-adjacent methylene groups in the alkylene group are an oxygen atom, a sulfur atom, a selenium atom, a nitrogen atom, -C≡C-, and one or more hydrogen atoms have 1 to 1 carbon atoms.
It may be substituted with a silylene group which may be substituted with an alkyl group of 0 or a vinylene group.

In the compound having a structure represented by the general formula (1) in the skeleton structure, examples of the group represented by G include:
Specifically, the following groups can be shown. -CH
_{2 -, - (CH 2)} 2 -, - (CH 2) 3 -, - (CH 2) 4
_{-, - (CH 2) 5} -, - (CH 2) 6 -, - CH 2 Si
_{(CH 3) 2 -, -} Si (CH 3) 2 CH 2 -, - Si (C
_{H 3) 2 -, - CH} 2 S -, - SCH 2 -, - CH 2 SO
_{-, - SOCH 2 -, -} N (CH 3) -, - N (CH 2 C
H ₃ ) —, —CH ＝ CH—, —C≡C—, —COO—,
_{-OCO -, - CH 2 O -} , - OCH 2 -, - (CH 2) 3
_{O -, - O (CH 2} ) 3 -, - CH = CHCH 2 CH 2 -,
_{-CH 2 CH = CHCH 2 -,} - CH 2 CH 2 CH = CH
-, - CH = CHCH = CH -, - CF 2 O -, - OC
F ₂ —, —CH ＝ CHCH ₂ O—, —OCH ₂ CH ＝ CH
-, - CF = CF -, - CH 2 CF 2 -, - CF 2 CH
_{2 -, - (CF 2)} 2 -, - (CF 2) 4 -, - (CH 2) 2
_{COO -, - OCO (CH 2} ) 2 -, - CH = CHCOO
-, -OCOCH = CH-, -CH = CHC≡C-,-
C≡CCH ＝ CH—, an oxygen atom, a sulfur atom, a selenium atom, and —SO—.

When particular attention is paid to the chemical and physical stability of a compound having a structure represented by the general formula (1) in the skeleton structure, G represents —CH ₂ —, — (CH ₂ ) ₂ —, − (CH ₂ )
_{3 -, - (CH 2)} 4 -, - (CH 2) 5 -, - (CH 2) 6
_{-, - CH 2 Si (CH} 3) 2 -, - Si (CH 3) 2 CH 2
_{-, - Si (CH 3)} 2 -, - CH 2 S -, - SCH 2 -,
_{-CH 2 SO -, - SOCH 2} -, - N (CH 3) -, -
_{N (CH 2 CH 3) -} , - CH = CH -, - COO -, -
_{OCO -, - CH 2 O -} , - OCH 2 -, - (CH 2) 3 O
—, —O (CH ₂ ) ₃ —, an oxygen atom, a sulfur atom, or —S
It is preferably O- or the like.

Preferred embodiments of the compound of the present invention represented by the general formula (2) are shown below. R ¹ and Y ¹ of the compound represented by the general formula (2) are each independently an alkyl group having 1 to 20 carbon atoms, a hydrogen atom, a halogen atom, a cyano group, a cyanic acid group, an isocyano group, or an isothiocyanic acid group. Wherein at least one non-adjacent methylene group in the alkyl group is an oxygen atom, a sulfur atom, a nitrogen atom, -C≡C-, and at least one hydrogen atom is an alkyl group having 1 to 10 carbon atoms. It may be substituted with a silylene group which may be substituted, or a vinylene group, and one or more hydrogen atoms in these alkyl groups may be substituted with a fluorine atom or a chlorine atom. The alkyl group may be optically active.

As the alkyl group represented by R ¹ and Y ¹ in the general formula (2), specifically, a saturated alkyl group consisting only of a carbon atom and a hydrogen atom, a haloalkyl group,
Alkoxy, haloalkoxy, alkenyl, haloalkenyl, alkenyloxy, haloalkenyloxy, alkynyl, haloalkynyl, alkynyloxy, haloalkynyloxy, alkoxyalkyl, haloalkoxyalkyl, alkoxyalkoxy Group, haloalkoxyalkoxy group, alkanoyl group,
Examples include a haloalkanoyl group, an alkanoyloxy group, a haloalkanoyloxy group, an alkoxycarbonyl group, and a haloalkoxycarbonyl group.

More specifically, examples of R ¹ and Y ¹ include the following groups or atoms. -CH _3, -C ₂ H
_{5, -C 3 H 7, -C} 4 H 9, -C 5 H 11, -C 6 H 13, -C 7
_{H 15, -C 8 H 17,} -C 9 H 19, -C 10 H 21, -CF
_{H 2, -CF 2 H, -CF} 3, -CH 2 CH 2 F, -CH 2 C
_{HF 2, -CH 2 CF 3,} -CF 2 CH 3, -CF 2 CF
_{2 H, -CFHCF 3, -CF 2} CF 3, - (CH 2) 2 CH
₂ F,-(CH ₂ ) ₂ CHF ₂ ,-(CH ₂ ) ₂ CF ₃ , -C
_{H 2 CF 2 CH 3, -CH} 2 CF 2 CF 3, -CF 2 C 2 H 5,
_{-C 3 F 7, -CF 2 CFHCF} 3, - (CH 2) 3 CH
_{2 F, - (CH 2)} 4 CH 2 F, - (CH 2) 5 CH 2 F, -
_{CF 2 C 3 H 7, -CH} 2 CF 2 C 2 H 5, - (CH 2) 2 CF 2
_{CH 3, -CF 2 C 4 H} 9, -CH 2 CF 2 CH 3, - (C
_{H 2) 2 CF 2 C 2} H 5, - (CH 2) 3 CF 2 CH 3,

-OCH ₃ , -OC ₂ H ₅ , -OC ₃ H ₇ ,-
_{OC 4 H 9, -OC 5 H} 11, -OC 6 H 1 3, -OC 7 H 15,
_{-OC 8 H 17, -OC 9 H} 19, -OC 10 H 21, -OCFH
_{2, -OCF 2 H, -OCF 3} , -OCH 2 CH 2 F, -O
_{CH 2 CHF 2, -OCH 2 CF} 3, -OCF 2 CH 3, -O
_{CF 2 CF 2 H, -OCFHCF 3} , -OCF 2 CF 3, -
O (CH ₂ ) ₂ CH ₂ F, —O (CH ₂ ) ₂ CHF ₂ , —O
(CH ₂ ) ₂ CF ₃ , —OCH ₂ CF ₂ CH ₃ , —OCH ₂ C
_{F 2 CF 3, -OCF 2 C} 2 H 5, -OC 3 F 7, -OCF 2 C
FHCF ₃ , —O (CH ₂ ) ₃ CH ₂ F, —O (CH ₂ ) ₄ C
_{H 2 F, -O (CH 2} ) 5 CH 2 F, -OCF 2 C 3 H 7, -
OCH ₂ CF ₂ C ₂ H ₅ , —O (CH ₂ ) ₂ CF ₂ CH ₃ , —O
_{CF 2 C 4 H 9, -OCH} 2 CF 2 CH 3, -O (CH 2) 2 C
_{F 2 C 2 H 5, -O} (CH 2) 3 CF 2 CH 3,

-CH = CH ₂ , -CH = CHCH ₃ , -C
_{H = CHC 2 H 5, -CH} = CHC 3 H 7, -CH = CHC
_{4 H 9, -CH 2 CH =} CHCH 3, -CH 2 CH = CHC 2
_{H 5, -CH 2 CH = CHC} 3 H 7, -CH 2 CH = CHC 4
_{H 9, - (CH 2)} 2 CH = CHCH 3, - (CH 2) 2 CH
_{= CHC 2 H 5, - (} CH 2) 2 CH = CHC 3 H 7, - (C
_{H 2) 2 CH = CHC 4} H 9, -CH 2 CH = CH 2, - (C
_{H 2) 2 CH = CH 2} , - (CH 2) 3 CH = CH 2, - (C
_{H 2) 4 CH = CH 2} , - (CH 2) 5 CH = CH 2, -CH
ＣＨCHCH ＝ CH ₂ , —CH ＝ CHCH ₂ CH ＝ CH ₂ ,
_{-CH = CH (CH 2) 2} CH = CH 2, -CH = CH
_{(CH 2) 3 CH = CH} 2, -CH 2 CH = CH (CH 2) 2
_{CH = CH 2, - (CH} 2) 2 CH = CH (CH 2) 2 CH
= CH ₂ ,

-CF = CF ₂ , -CH = CF ₂ , -CH =
_{CHF, -CH 2 CF = CF 2} , -CH 2 CH = CFH,
_{- (CH 2) 2 CH =} CF 2, - (CH 2) 2 CH = CH
_{F, - (CH 2) 3} CH = CF 2, - (CH 2) 3 CH = C
_{HF, - (CH 2) 4} CH = CF 2, - (CH 2) 4 CH =
_{CHF, - (CH 2) 5} CH = CF 2, - (CH 2) 5 CH
_{= CHF, -CH = CHCH 2 CH} 2 F, -CH = CHC
_{H 2 CH 2 Cl, -CH =} CHCH 2 CHF 2, -CH = C
_{HCH 2 CF 3, -CH = CH} (CH 2) 2 CH 2 F, -C
_{H = CH (CH 2) 2} CHF 2, -CH = CH (CH 2) 2
_{CF 3, -CH = CH (CH} 2) 3 CH 2 F, -CH = CH
(CH ₂ ) ₃ CHF ₂ , —CH ＝ CH (CH ₂ ) ₃ CF ₃ ,
_{CH = CH (CH 2) 4} CH 2 F, -CH = CH (CH 2)
₄ CHF ₂ , —CH ＝ CH (CH ₂ ) ₄ CF ₃ , —CH ₂ CH
_{= CH (CH 2) 2 CH} 2 F, -CH 2 CH = CHCH 2 C
_{H 2 F, - (CH 2} ) 2 CH = CH (CH 2) 2 CH 2 F, -
_{(CH 2) 2 CH = CHCH} 2 CH 2 F, -CH = CHCH
_{2 CH = CF 2, -CH =} CH (CH 2) 2 CH = CF 2,
_{-CH = CH (CH 2) 2} CF = CF 2, -CH = CH
(CH ₂ ) ₃ CHFCH ₃ ,

--OCH ₂ CH = CHCH ₃ , --OCH ₂ C
_{H = CHC 2 H 5, -OCH} 2 CH = CHC 3 H 7, -OC
_{H 2 CH = CHC 4 H 9} , -O (CH 2) 2 CH = CHC
_{H 3, -O (CH 2)} 2 CH = CHC 2 H 5, -O (CH 2)
₂ CH = CHC ₃ H ₇ , —O (CH ₂ ) ₂ CH = CHC
_{4 H 9, -OCH 2 CH =} CH 2, -O (CH 2) 2 CH = C
_{H 2, -O (CH 2)} 3 CH = CH 2, -O (CH 2) 4 CH
ＣＨCH ₂ , —O (CH ₂ ) ₅ CH ＝ CH ₂ , —OCH ₂ CH
ＣＨCH (CH ₂ ) ₂ CH 2CH ₂ , —O (CH ₂ ) ₂ CH =
CH (CH ₂ ) ₂ CH = CH ₂ ,

-OCH ₂ CF = CF ₂ , -OCH ₂ CH =
_{CF 2, -OCH 2 CF = CHF} , -O (CH 2) 2 CH =
_{CF 2, -O (CH 2)} 2 CH = CHF, -O (CH 2) 3
CH = CF ₂ , —O (CH ₂ ) ₃ CH = CHF, —O (C
_{H 2) 4 CH = CF 2} , -O (CH 2) 4 CH = CHF, -
_{O (CH 2) 5 CH =} CF 2, -O (CH 2) 5 CH = CH
_{F, -OCH 2 CH = CHCH 2} CH 2 F, -O (CH 2)
_{2 CH = CH (CH 2)} 2 CH 2 F, -O (CH 2) 2 CH =
CHCH ₂ CH ₂ F,

-C≡CH, -C≡CCH ₃ , -C≡CC _{2
H 5, -C≡CC 3 H 7,} -C≡CC 4 H 9, -CH 2 C≡C
_{H, -CH 2 C≡CCH 3, -CH} 2 C≡CC 2 H 5, -C
_{H 2 C≡CC 3 H 7, -CH} 2 C≡CC 4 H 9, - (CH 2) 2
C≡CH, — (CH ₂ ) ₂ C≡CCH ₃ , — (CH ₂ ) ₂ C
_{≡CC 2 H 5, - (CH} 2) 2 C≡CC 3 H 7, - (CH 2) 2
C≡CC ₄ H ₉ , — (CH ₂ ) ₃ C≡CH, — (CH ₂ ) ₃ C
{CCH ₃ ,-(CH ₂ ) ₃ C} CC ₂ H ₅ ,-(CH ₂ ) _{3
C≡CC 3 H 7, - (CH} 2) 3 C≡CC 4 H 9, -C≡CC
_{F 3, -C≡CC 2 F 5,} -C≡CC 3 F 7, -CH 2 C≡C
CF ₃ , — (CH ₂ ) ₂ C≡CCF ₃ ,

[0047] -OCH ₂ C≡CH, -OCH ₂ C≡CCH
₃ , —OCH ₂ C≡CC ₂ H ₅ , —OCH ₂ C≡CC ₃ H ₇ ,
—OCH ₂ C≡CC ₄ H ₉ , —O (CH ₂ ) ₂ C≡CH,
O (CH ₂ ) ₂ C≡CCH ₃ , —O (CH ₂ ) ₂ C≡CC ₂ H
_{5, -O (CH 2) 2} C≡CC 3 H 7, -O (CH 2) 2 C≡
CC ₄ H ₉ , —O (CH ₂ ) ₃ C≡CH, —O (CH ₂ ) ₃ C
{CCH ₃ , —O (CH ₂ ) ₃ C} CC ₂ H ₅ , —O (C
_{H 2) 3 C≡CC 3 H 7} , -O (CH 2) 3 C≡CC 4 H 9,

--OCH ₂ C≡CCF ₃ , --O (CH ₂ ) ₂ C
≡CCF ₃ , —CH ₂ OCH ₃ , —CH ₂ OC ₂ H ₅ , —CH
_{2 OC 3 H 7, -CH 2} OC 4 H 9, -CH 2 OC 5 H 11, -
_{(CH 2) 2 OCH 3,} - (CH 2) 2 OC 2 H 5, - (C
_{H 2) 2 OC 3 H 7} , - (CH 2) 2 OC 4 H 9, - (CH 2) 2
_{OC 5 H 11, - (CH} 2) 3 OCH 3, - (CH 2) 3 OC 2
_{H 5, - (CH 2)} 3 OC 3 H 7, - (CH 2) 3 OC 4 H 9,
— (CH ₂ ) ₃ OC ₅ H ₁₁ , — (CH ₂ ) ₄ OCH ₃ ,

--CF ₂ OCH ₃ , --CF ₂ OC ₂ H ₅ , --C
_{F 2 OC 3 H 7, -CF} 2 OC 4 H 9, -CF 2 OC 5 H 11, -
_{CH 2 OCF 3, -CH 2 OC} 2 F 5, -OCH 2 OCH 3,
_{-OCH 2 OC 2 H 5, -OCH} 2 OC 3 H 7, -OCH 2 O
_{C 4 H 9, -OCH 2 OC} 5 H 11, -O (CH 2) 2 OC
_{H 3, -O (CH 2)} 2 OC 2 H 5, -O (CH 2) 2 OC 3 H
_{7, -O (CH 2) 2} OC 4 H 9, -O (CH 2) 2 OC
_{5 H 11, -O (CH 2} ) 3 OCH 3, -O (CH 2) 3 OC 2
_{H 5, -O (CH 2)} 3 OC 3 H 7, -O (CH 2) 3 OC 4 H
_{9, -O (CH 2) 3} OC 5 H 11, -O (CH 2) 4 OC
H ₃ ,

--OCH ₂ OCF ₃ , --OCH ₂ OC ₂ F ₅ ,
_{-COCF 3, -COCHF 2, -COC 2} F 5, -COC
_{3 F 7, -COCH 2 CF 3} , -OCOCH 3, -OCOC 2
_{H 5, -OCOC 3 H 7,} -OCOC 5 H 11, -OCOC 7
H ₁₅ , —OCOCF ₃ , —OCOCHF ₂ , —OCOC _{2
F 5, -OCOC 3 F 7,} -OCOCH 2 CF 3, -COO
_{CH 3, -COOC 2 H 5,} -COOC 3 H 7, -COOC 4
_{H 9, -COOC 5 H 11,} -COOCH (CH 3) C
_{6 H 13, -COOCH 2 F,} -COOCH 2 CF 3, -CO
_{O (CH 2) 2 CF 3} , -COO (CH 2) 3 CF 3, -CO
O (CH ₂ ) ₄ CH ₂ F,

A hydrogen atom, a halogen atom, a cyano group, a cyanate group, an isocyano group, and an isothiocyanate group.

The chemical reaction of the compound represented by the general formula (2)
When particular attention is paid to physical stability, R ¹ and Y ¹ are a saturated alkyl group, a haloalkyl group, an alkoxy group, a haloalkoxy group, an alkoxyalkyl group, a haloalkoxyalkyl group consisting only of a carbon atom and a hydrogen atom, Alkoxyalkoxy group, haloalkoxyalkoxy group, alkanoyl group, haloalkanoyl group, alkanoyloxy group, haloalkanoyloxy group, alkoxycarbonyl group, haloalkoxycarbonyl group, hydrogen atom, halogen atom, cyano group, cyano group, or isocyano group It is preferred that

When it is desired to increase the absolute value of the negative dielectric anisotropy value of the compound represented by the general formula (2), R ¹ and Y ¹ are the same as those of a saturated alkyl composed of only a carbon atom and a hydrogen atom. Group, alkoxy group, alkenyl group, alkenyloxy group, alkynyl group, alkynyloxy group, alkoxyalkyl group, alkoxyalkoxy group, alkanoyl group, alkanoyloxy group, alkoxycarbonyl group,
Alternatively, a substituent having low polarity such as a hydrogen atom is preferable.

X of the compound represented by the general formula (2)¹,
X^Two, X^ThreeAnd X^FourIs a single bond,-(CH _Two)_Two-, -CH
= CH-, -C≡C-, -COO-, -OCO-, -C
H_TwoO-, -OCH_Two-,-(CH_Two)_Four-,-(CH_Two)_Three
O-, -O (CH_Two)_Three-, -CH = CHCH_TwoCH_Two−,
-CH_TwoCH = CHCH_Two-, -CH_TwoCH_TwoCH = CH
-, -CH = CHCH = CH-, -CF_TwoO-, -OC
F_Two-, -CH = CHCH_TwoO-, -OCH_TwoCH = CH
-, -CF = CF-, -CH_TwoCF_Two-, -CF_TwoCH
_Two−, − (CF_Two)_Two−, − (CF_Two)_Four-,-(CH_Two)_Two
COO-, -OCO (CH_Two)_Two-, -CH = CHCOO
-, -OCOCH = CH-, -CH = CHC≡C-, or
Is -C≡CCH = CH-.

Chemical reaction of the compound represented by the general formula (2)
When paying particular attention to physical stability, X ¹ , X ² , X ³ and X ⁴ are each a single bond, — (CH ₂ ) ₂ —, —COO—, or —OC.
_{O -, - CH 2 O -} , - OCH 2 -, - (CH 2) 4 -, -
_{(CH 2) 3 O -,} - O (CH 2) 3 -, - CF 2 O -, -
_{OCF 2 -, - CH 2 CF} 2 -, - CF 2 CH 2 -, - (C
_{F 2) 2 -, - (} CF 2) 4 -, - (CH 2) 2 COO-, or -OCO (CH _{2) 2} - is preferably.

The ring A ^{1 of the} compound represented by the general formula (2)
At least one of ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ is a ring represented by the above general formula (1). Specifically, the following rings are exemplified. 3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene-2,7-diyl, 3,4,5,6-tetrafluoro-9-oxa-
9,10-dihydrophenanthrene-2,7-diyl,
3,4,5,6-tetrafluoro-10-oxo-9-
Oxa-9,10-dihydrophenanthrene-2,7-
Diyl, 3,4,5,6-tetrafluoro-9-thia-
9,10-dihydrophenanthrene-2,7-diyl,
3,4,5,6-tetrafluoro-9-thia-9,10
-Dihydrophenanthrene 9-oxide-2,7-diyl, 3,4,5,6-tetrafluoro-9,9-dimethyl-9-sila-9,10-dihydrophenanthrene-
2,7-diyl, 3,4,5,6-tetrafluoro-9
H-fluorene-2,7-diyl, 1,2,8,9-tetrafluorodibenzothiophene-3,7-diyl,
1,2,8,9-tetrafluorodibenzothiophene sulfoxide-3,7-diyl, 1,2,8,9-tetrafluorodibenzofuran-3,7-diyl, 1,2,2
8,9-tetrafluoro-5,5-dimethyldibenzosilolane-3,7-diyl, 3,4,5,6-tetrafluoro-9-methyl-9H-carbazole-2,7-diyl, 3,4 , 5,6-tetrafluorodibenzo [a,
c] cycloheptane-2,7-diyl, 3,4,5,6
-Tetrafluorodibenzo [a, c] cyclooctane-
2,7-diyl and 3,4,5,6-tetrafluorodibenzo [a, c] oxepin-2,7-diyl. These rings may be optically active.

Preferred rings other than those described above include bicyclo [1.1.1] pentane-1,3-diyl, trans-cyclohexane-1,4-diyl, and cyclohexa-
1-ene-1,4-diyl and 1,4-phenylene, and a carbon atom constituting these rings is a nitrogen atom,
An oxygen atom or a sulfur atom may be substituted, and a hydrogen atom on the ring may be substituted with a halogen atom or a cyano group.

Specifically, 1-cyano-trans-cyclohexane-1,4-diyl, 2,2-difluoro-trans-cyclohexane-1,4-diyl, 2-fluorocyclohex-1-ene-1, 4-diyl, 2,3-
Difluorobenzene-1,4-diyl and 2,2-dichlorobicyclo [1.1.1] pentane-1,3-diyl. Further, a hydrogen atom on the ring is a fluorine atom,
The ring which may be substituted with a chlorine atom or a cyano group also includes the following rings. Bicyclo [1.1.
1] pentane-1,3-diyl, trans-cyclohexane-1,4-diyl, cyclohex-1-ene-1,
4-diyl, 1,4-phenylene, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, pyrazine-2,5-diyl, pyridazine-3, 6-diyl, tetrahydropyran-2,
5-diyl, 1,3-dithiane-2,5-diyl, 1,
3-oxathiane-2,5-diyl, and bicyclo [2.2.2] octane-1,4-diyl.

Chemical reaction of the compound represented by the general formula (2)
When particular attention is paid to physical stability, ring A ¹ , ring A ² , ring A
^3, the preferred ring to the ring A ⁴ and ring A ⁵ are, ring represented by the general formula (1) (e.g., 3,4,5,6-tetrafluoro -
9,10-dihydrophenanthrene-2,7-diyl)
In the other ring, ring A ¹ , ring A ² , ring A ³ ,
Preferred rings for the ring A ⁴ and the ring A ⁵ include the following rings. 1-cyano-trans-cyclohexane-1,
4-diyl, 2,2-difluoro-trans-cyclohexane-1,4-diyl, 2-fluorocyclohexa-
Hydrogen on a ring such as 1-ene-1,4-diyl, 2,3-difluorobenzene-1,4-diyl, or 2,2-dichlorobicyclo [1.1.1] pentane-1,3-diyl Examples of the ring whose atom may be substituted with a fluorine atom, a chlorine atom or a cyano group include bicyclo [1.1.1] pentane-1,3-diyl, trans-cyclohexane-1,
4-diyl, cyclohex-1-ene-1,4-diyl, 1,4-phenylene, 1,3-dioxane-2,5
-Diyl, pyrimidine-2,5-diyl, pyridine-
2,5-diyl, pyridazine-3,6-diyl, tetrahydropyran-2,5-diyl, 1,3-dithiane-
2,5-diyl, 2,3-difluorobenzene-1,4
-Diyl, and 1,3-oxathiane-2,5-diyl.

When it is desired to increase the absolute value of the negative dielectric anisotropy value of the compound represented by the general formula (2), the ring A ¹ ,
Preferred rings for ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ are those represented by the general formula (1) (for example, 3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene- 2,7-
Diyl), but in other rings, ring A ¹ , ring A ² ,
Preferred rings for the ring A ³ , the ring A ⁴ and the ring A ⁵ include the following rings. 1-cyano-trans-cyclohexane-1,4-diyl, 2,2-difluoro-trans-
Cyclohexane-1,4-diyl, 2-fluorocyclohex-1-ene-1,4-diyl, 2,3-difluorobenzene-1,4-diyl, and 2,2-dichlorobicyclo [1.1.1. Pentane-1,3-diyl. Examples of the ring in which a hydrogen atom on the ring may be substituted with a fluorine atom, a chlorine atom or a cyano group include trans-cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-
Diyl, pyridazine-3,6-diyl, and tetrahydropyran-2,5-diyl.

The compounds of the present invention described in claims 1 to 4 have a negative dielectric anisotropy value having a large absolute value. For this reason,
By mainly using the compound of the present invention, a liquid crystal composition having a negative dielectric anisotropy value can be adjusted. This liquid crystal composition is particularly suitable for a device using a liquid crystal composition having a negative dielectric anisotropy value, such as a vertical alignment method described in JP-A-2-176625 or IPS. It is useful for making. In addition, by mixing and using the compound of the present invention with another liquid crystal compound or composition, an appropriate setting of the dielectric anisotropy value can be performed. Can be spread. The compounds of the present invention according to claims 1 to 4 have a small elastic constant and the temperature dependence of the constant is small. Therefore, a novel liquid crystal composition having a low driving voltage can be prepared by using the compound of the present invention.

The compounds of the present invention described in claims 1 to 4 have good compatibility with other liquid crystal compounds. For this reason, when the compound of the present invention is compounded in a liquid crystal composition, problems such as precipitation of the compound hardly occur. Further, the compound of the present invention can be incorporated in a large amount into the liquid crystal composition, and as a result, the excellent properties of the compound of the present invention can be strongly reflected in the liquid crystal composition.

The compound of the present invention according to claims 1 to 4,
By appropriately designing the structure, a desired value of the refractive index anisotropy value can be obtained. That is, when a particularly high refractive index anisotropy value is required, a ring having many sites having a resonance structure such as an aromatic ring may be selected. When a low refractive index anisotropy value is required, trans-cyclohexane-
What is necessary is just to select the ring which has many sites which do not have a resonance structure, such as a 1, 4- diyl ring. More specifically, the compound of the present invention represented by the general formula (2) is represented by R ¹ , Y ¹ , X ¹ ,
X ² , X ³ , X ⁴ , ring A ¹ , ring A ² , ring A ³ , ring A ⁴ , ring A ⁵ ,
By appropriately selecting a ¹ , a ² , a ³ , a ⁴ and a ⁵ , it is possible to obtain a desired value of the refractive index anisotropy value. More specifically, the refractive index anisotropy value can be adjusted by appropriately selecting the ring A ¹ , the ring A ² , the ring A ³ , the ring A ⁴ and the ring A ⁵ . That is, when a particularly high refractive index anisotropy value is required, a ring having many sites having a resonance structure such as an aromatic ring may be selected. When a low refractive index anisotropy value is required, a ring having many sites having no resonance structure, such as a trans-cyclohexane-1,4-diyl ring, may be selected. By freely selecting the refractive index anisotropy value, the degree of freedom in designing the liquid crystal panel is increased.

Each of the compounds of the present invention according to claims 1 to 4 has a low viscosity and can be used in a large amount in a liquid crystal composition.
It does not significantly increase the viscosity of the entire liquid crystal composition.
Further, the temperature dependence of the viscosity, particularly at low temperatures, is extremely small. By using the liquid crystal compound having the excellent viscosity, a liquid crystal composition having a high-speed response can be adjusted. The compounds of the present invention described in claims 1 to 4 are all chemically and physically stable, and the liquid crystal compositions using them have high specific resistance and high voltage holding ratio. It has high stability against external factors such as ultraviolet rays and heating, and has sufficient chemical and physical stability as a component of a practical liquid crystal composition.

The phase transition temperature of the compounds of the present invention described in claims 1 to 4 can be adjusted by appropriately selecting the number of rings. That is, when a particularly high clearing point is required, a compound having a large number of rings may be selected, and when a particularly low clearing point is required, a compound having a small number of rings may be selected.

As described above, the compounds of the present invention described in claims 1 to 4 have various physical properties suitable as electro-optical display materials. By using the compound of the present invention, a novel liquid crystal composition having good characteristics can be prepared. In addition, a liquid crystal compound having desired characteristics, a liquid crystal composition and a liquid crystal display device using the same can be obtained by appropriately designing the structure according to the application. For example, although the compound of the present invention is characterized by exhibiting a large negative dielectric anisotropy value, it can be used not only for a liquid crystal composition having a negative dielectric anisotropy value but also for a positive liquid crystal composition. It can be added to a composition having a dielectric anisotropy value to adjust the dielectric anisotropy value and other properties. More specifically, the compound of the present invention or a liquid crystal composition using the same may be prepared in various display systems using a compound or a composition having a negative dielectric anisotropy value (for example, described in JP-A-2-176625). IPS, ECB (HAN or DAP)
), DS, GH or PC, etc.
It can be used for a vertical alignment method as described in JP-A-76625 and IPS. However, not only can these methods be used, but also various display methods (for example, TN, STN,
Or TN-based AM (TFT or MIM)
It can also be used to improve or adjust various properties (for example, dielectric anisotropy value, elastic constant, refractive index anisotropy value, viscosity, or chemical and physical stability) of a liquid crystal composition for use. .

Hereinafter, the liquid crystal composition of the present invention will be described. The liquid crystal composition according to the present invention comprises at least one of the compounds according to any one of claims 1 to 4 in an amount of from 0.1 to 99.9.
It is preferable that the content is contained in a ratio of% by weight in order to exhibit excellent characteristics. More specifically, the liquid crystal composition provided by the present invention comprises, in addition to the first component containing at least one compound according to any one of claims 1 to 4, a general formula ( It is completed by mixing the compounds selected from the compound group represented by 3) to (13) at an appropriate ratio. The compounds represented by the general formulas (3) to (5) used in the liquid crystal composition of the present invention preferably include the following compounds. (R ² and Y ² represent the same meaning as described above.)

[0068]

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[0069]

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[0070]

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The compounds represented by the general formulas (3) to (5) are compounds having a positive dielectric anisotropy value, have excellent thermal stability and chemical stability, and have a high voltage holding ratio. T, which requires high reliability such as high resistance or large specific resistance
When a liquid crystal composition for FT is prepared, it is a particularly preferable compound. When adjusting the liquid crystal composition for TFT,
The compound represented by the general formulas (3) to (5) can be used in an amount of 0.1 to 99.9% by weight, preferably 10 to 97% by weight, based on the total weight of the liquid crystal composition. %, More preferably 40 to 95% by weight. Further, the compounds represented by the general formulas (8) to (10) may be further contained for the purpose of adjusting the viscosity. When preparing a liquid crystal composition for STN or TN, the compounds represented by the general formulas (3) to (5) can be used. In that case, the use amount of 50% by weight or less is preferable.

The compounds represented by the general formulas (6) and (7) used in the liquid crystal composition of the present invention preferably include the following compounds. (R ³ , Y ³ and R ⁴
Represents the same meaning as described above. )

[0073]

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[0074]

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The compounds represented by the general formulas (6) and (7) have a positive and large dielectric anisotropy value, and are particularly used for the purpose of reducing the threshold voltage of the liquid crystal composition. Also,
It is also used for the purpose of expanding the nematic range such as adjusting the refractive index anisotropy value and increasing the clearing point. Further, it is also used for the purpose of improving the steepness of the VT curve of the liquid crystal composition for STN or TN.

The compounds represented by the general formulas (6) and (7) are particularly preferred when preparing a liquid crystal composition for STN and TN. General formulas (6) and (7)
When the amount of the compound represented by the formula (1) is increased, the threshold voltage of the liquid crystal composition decreases and the viscosity increases. Therefore, as long as the viscosity of the liquid crystal composition satisfies the required characteristics, it is advantageous to use a large amount of the liquid crystal composition because it can be driven at low voltage. The amount of the compound represented by the general formulas (6) to (7) is determined by the amount of STN
Alternatively, when adjusting the liquid crystal composition for TN, 0.1 to 9
Although it can be used in the range of 9.9% by weight,
It is 97% by weight, more preferably 40 to 95% by weight.

The compounds represented by formulas (8) to (10) used in the liquid crystal composition of the present invention preferably include the following compounds. (R ⁵ and R ⁶ represent the same meaning as described above.)

[0078]

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The compounds represented by the general formulas (8) to (10) have a small absolute value of the dielectric anisotropy and are almost neutral. The compound represented by the general formula (8) is mainly used for adjusting the viscosity or adjusting the value of the refractive index anisotropy. Further, the compounds represented by the general formulas (9) and (10) are used for the purpose of expanding the nematic range such as increasing the clearing point or adjusting the refractive index anisotropy value. General formula (8)
When the amount of the compound represented by (10) is increased, the threshold voltage of the liquid crystal composition increases, and the viscosity decreases. Therefore, as long as the required value of the threshold voltage of the liquid crystal composition is satisfied, it can be used in a large amount. The amounts of the compounds represented by the general formulas (8) to (10)
When preparing a liquid crystal composition for use, the content is preferably 40% by weight, more preferably 35% by weight or less. Also, S
When preparing TN or a liquid crystal composition for TN, the content is preferably 70% by weight or less, more preferably 60% by weight or less.

The compounds represented by formulas (11) to (13) used in the liquid crystal composition of the present invention preferably include the following compounds. (R ⁷ and R ⁸ represent the same meaning as described above.)

[0081]

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The compounds represented by the general formulas (11) to (13) are compounds having a negative value of dielectric anisotropy, like the compounds according to the first to fourth aspects of the present invention. As a base compound of the liquid crystal composition of the present invention or for controlling the dielectric anisotropy of a P-type liquid crystal composition. For other uses,
The compound represented by the general formula (11) is a bicyclic compound,
It is mainly used for adjusting the threshold voltage, adjusting the viscosity or adjusting the refractive index anisotropy value. The compound represented by the general formula (12) is used for the purpose of widening the nematic range such as increasing the clearing point or adjusting the refractive index anisotropy value. The compound represented by the general formula (13) is used for the purpose of increasing the nematic range, reducing the threshold voltage, and increasing the refractive index anisotropy value.

The compounds represented by the general formulas (11) to (13) are mainly used for an N-type liquid crystal composition. When the amount of the compound is increased, the threshold voltage of the liquid crystal composition is reduced. Becomes larger. Therefore, it is desirable to use a small amount as long as the required value of the threshold voltage of the liquid crystal composition is satisfied. However, the absolute value of the negative dielectric anisotropy is 5
If the amount is less than 40% by weight, low-voltage driving may not be performed. General formulas (11) to (1)
The amount of the compound represented by 3) is preferably 40% by weight or more, more preferably 50 to 95% by weight, when a liquid crystal composition for an N-type TFT is prepared. In order to control the elastic constant and control the voltage-transmittance curve (VT curve) of the liquid crystal composition, the general formula (11) is used.
The compound represented by (13) may be mixed with the P-type composition. In this case, the amount of the compounds represented by the general formulas (11) to (13) is preferably 30% by weight or less.

The liquid crystal composition of the present invention contains OCB
(Optically Compensated Bi
Except for a special case such as a liquid crystal composition for reference, usually, a helical structure of the liquid crystal composition is induced to adjust a required twist angle, and reverse twist (reverse twist) is performed.
For the purpose of preventing ist), an optically active compound is added. In the present invention, any of the known optically active compounds used for such a purpose can be used. Preferred examples of the compound include the following optically active compounds.

[0085]

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In the liquid crystal composition of the present invention, these optically active compounds are usually added to adjust the twist pitch. The twist pitch is preferably adjusted in the range of 40 to 200 μm for a liquid crystal composition for TFT and TN. In the case of a liquid crystal composition for STN, it is preferable to adjust the composition to a range of 6 to 20 μm. In addition, bistable TN (Bis
In the case of table TN), the thickness is preferably adjusted to a range of 1.5 to 4 μm. Further, two or more optically active compounds may be added for the purpose of adjusting the temperature dependence of the pitch.

The liquid crystal composition of the present invention comprises a merocyanine compound,
A dichroic dye such as a styryl-based, azo-based, azomethine-based, azoxy-based, quinophthalone-based, anthraquinone-based, or tetrazine-based dye can be added to be used as a liquid crystal composition for GH. Alternatively, NCAP prepared by microencapsulating nematic liquid crystal, or polymer network liquid crystal display device (PN
Polymer-dispersed liquid crystal display device (P
It can also be used as a liquid crystal composition for DLCD). In addition, it can be used as a liquid crystal composition for DS.

The liquid crystal composition of the present invention is prepared by a conventional method. Generally, a method of dissolving various components at a high temperature is used.

The compounds of the present invention described in claims 1 to 4 can be easily produced by known organic synthetic chemistry techniques. One example of the production method is shown in Reaction Formula 1.

[0090]

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Hereinafter, the above synthesis route will be described. Compounds of formula 1 are derived to compounds of formula 2 by a Friedel-Crafts reaction with valeryl chloride in the presence of aluminum chloride. After reduction with sodium borohydride, the compound of formula 2 is dehydrated under acidic conditions to yield the compound of formula 3 . The compound of the formula 3 is derived to the compound of the formula 4 by catalytic reduction using palladium carbon as a catalyst. The compound of formula 4 is lithiated with sec-butyllithium and then reacted with trimethyl borate to
Derived to the compound of Formula 5 . Compounds of formula 5 are derived to compounds of formula 6 by oxidation with hydrogen peroxide.
The compound of formula 6 is reacted with sodium hydride and then with trans-4-bromomethyl-n-propylcyclohexane to derive the desired compound of formula 7 .

[0092]

EXAMPLES The production method and use examples of the compound of the present invention will be described in more detail with reference to the following examples. The present invention is not limited by the embodiments. In the description of the examples, N is the specified concentration (gram equivalent / l), M
Represents a molar concentration (mol / l), and Δε of the liquid crystalline compound
(Dielectric anisotropy value) is an extrapolated value (2) from a composition comprising the following base liquid crystal A (85 wt%) and the compound (15 wt%).
Δn (measured at 5 ° C.)
Is the following mother liquid crystal B85wt% and the compound 15wt%
And the measured value (measured at 25 ° C.) of the composition consisting of: Composition of mother liquid crystal A

[0093]

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Five types of ester compounds represented by the above general formula and having different alkyl groups (R ⁹ , R ¹⁰ ) at both terminals are represented by the following formula:
The following mixture was mixed to obtain mother liquid crystal A.

Composition of Mother Liquid Crystal B

[0096]

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Mother liquid crystals B were obtained by mixing four types of compounds represented by the above general formula and having different terminal alkyl groups (R ¹¹ , R ¹² ) in the following proportions.

Example 1 2- (trans-4-n-propylcyclohexyl) methyloxy-3,4,5,6-tetrafluoro-7-n
-Pentyl-9,10-dihydrophenanthrene ( 7 )
First Step 2-n-Valeryl-3,4,5,6-tetrafluoro-
Synthesis of 9,10-dihydrophenanthrene ( 2 ) 3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene ( 2 ) (252.2 g, 1.0 mol)
Was dissolved in carbon disulfide (600 ml) and cooled to -10 ° C. While maintaining the same temperature, anhydrous aluminum chloride (1
20.0 g, 0.90 mol), and then, while maintaining the same temperature, valeryl chloride (132.6 g, 1.1 mol).
l) was added dropwise over 30 minutes, and the mixture was stirred at the same temperature for 2 hours.
After completion of the stirring, the reaction solution was poured into 1N diluted hydrochloric acid (800 ml) under cooling, and then extracted with toluene (1000 ml). After the obtained organic layer was washed with water (800 ml), it was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent: toluene) to give 2-n-valeryl-3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene ( 2 ) (80.9g, 0.24mo
1; yield 24%). MS / 336 (M ^<+> ).

Second Step Synthesis of 2- (penta-1-enyl) -3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene ( 3 ) 2-n-valeryl obtained in the first step -3,4,5,6-
To a mixture of tetrafluoro-9,10-dihydrophenanthrene ( 2 ) (80.7 g, 0.24 mol) and methanol (300 ml) at −10 ° C. was added sodium borohydride (4.0 g, 0.11 mol), Thereafter, the temperature was gradually raised, and the reaction was carried out at 0 ° C. for 2 hours. After completion of the reaction, 1N diluted hydrochloric acid (100 ml) was added to the reaction solution under cooling, and then methanol was distilled off under reduced pressure. Toluene (30
0 ml) was added for extraction. The obtained organic layer was washed with water (30
0 ml) and dried over anhydrous magnesium sulfate. To this organic layer was added p-toluenesulfonic acid monohydrate (2.3 g, 0.012 mol), and the mixture was heated under reflux for 1 hour. After the reaction solution was cooled to room temperature, a 1N aqueous sodium hydrogen carbonate solution (20 ml) was added to neutralize the reaction solution, and then the organic layer was separated. The obtained organic layer was washed with water (3
00 ml) and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to give 2- (penta-1-
Enyl) -3,4,5,6-tetrafluoro-9,10
-A crude product of dihydrophenanthrene ( 3 ) was obtained.

Third stage 2-n-pentyl-3,4,5,6-tetrafluoro-
Synthesis of 9,10-dihydrophenanthrene ( 4 ) 2- (penta-1-enyl) -3, obtained in the second step
A mixture of a crude product of 4,5,6-tetrafluoro-9,10-dihydrophenanthrene ( 3 ), 5% palladium carbon (4.0 g), ethanol (200 ml) and toluene (200 ml) was stirred at room temperature and normal temperature. Hydrogenated under pressure for 5 hours. After completion of the reaction, palladium carbon was removed by filtration, the solvent was distilled off from the filtrate under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent: hexane) to give 2-n-pentyl-3,4,4. 5,6
-Tetrafluoro-9,10-dihydrophenanthrene ( 4 ) (11.7 g, 0.036 mol, 15% yield from 2 ) was obtained. MS / 322 (M ^<+> ).

Fourth stage 7- (2-n-pentyl-3,4,5,6-tetrafluoro-9,10-dihydrophenanthryl) boric acid ( 5 )
Synthesis of 2-n-pentyl-3,4,5,6- obtained in the third step
Tetrafluoro-9,10-dihydrophenanthrene ( 4 ) (11.6 g, 0.036 mol) and THF
(Tetrahydrofuran) (60 ml) to a mixture of
At 8 ° C, a 1.56 M sec-butyllithium hexane solution (25.4 ml, 0.040 mol) was added dropwise over 30 minutes, and the mixture was stirred for 1 hour. Then, a THF (20 ml) solution of trimethyl borate (5.6 g, 0.054 mol) was added dropwise to the reaction solution at the same temperature in 30 minutes, and then the temperature was gradually raised and the reaction was carried out at room temperature for 2 hours. After completion of the reaction, the reaction solution was added to 2N dilute hydrochloric acid (80 ml), and then extracted with diethyl ether (200 ml). After the obtained organic layer was washed with water (150 ml), it was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was washed with hexane to give 7- (2-n-pentyl-3,4,5,6-
Tetrafluoro-9,10-dihydrophenanthryl)
Boric acid ( 5 ) (9.52 g, 0.026 mol, yield 72)
%). MS / 366 (M ^<+> ).

Stage 5: 2-n-pentyl-3,4,5
Synthesis of 6-tetrafluoro-7-hydroxy-9,10-dihydrophenanthrene ( 6 ) 7- (2-n-pentyl-3,4, obtained in the fourth step
5,6-tetrafluoro-9,10-dihydrophenanthryl) boric acid ( 5 ) (9.47 g, 0.026 mol)
Was dissolved in formic acid (50 ml), and a 30% by weight aqueous hydrogen peroxide solution (5.90 g, 0.052 mol) was added dropwise under ice cooling. The reaction solution was heated and reacted at 50 ° C. for 2 hours.
After completion of the reaction, the mixture was cooled to room temperature, 1N aqueous sodium thiosulfate solution (100 ml) was added, and the mixture was reacted at room temperature for 2 hours. Next, toluene (150 ml) was added to the reaction solution for extraction, and the obtained organic layer was washed with water (100 ml) and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was subjected to silica gel column chromatography (elution solvent: diethyl ether / ethanol = 20 /
After purifying in 1), 2-n-pentyl-3,4,5,6-
Tetrafluoro-7-hydroxy-9,10-dihydrophenanthrene ( 6 ) (6.07 g, 0.018 mo
1; 69% yield). MS / 338 (M ^<+> ).

Sixth stage 2- (trans-4-n-propylcyclohexyl) methyloxy-3,4,5,6-tetrafluoro-7-n
-Pentyl-9,10-dihydrophenanthrene ( 7 )
Synthesis of 2-n-pentyl-3,4,5,6- obtained in the fifth step
Tetrafluoro-7-hydroxy-9,10-dihydrophenanthrene ( 6 ) (6.02 g, 0.018mo)
l), a mixture of THF (50 ml) and N, N-dimethylformamide (50 ml) was ice-cooled, and 60% sodium hydride (1.08 g, 0027 mol) was added. The temperature was gradually raised to room temperature, and the reaction was continued until the generation of hydrogen gas was completed. After ice-cooling again, trans-4-bromomethyl-
n-propylcyclohexane (4.34 g, 0.020
mol) in a THF (20 ml) solution.
The temperature was raised to 0 ° C., and the reaction was performed for 3 hours. After completion of the reaction, the reaction solution was cooled to room temperature, concentrated under reduced pressure until the volume of the reaction solution was reduced to about one-third, water (60 ml) was added, and then extracted with toluene (120 ml). The obtained organic layer was dried with anhydrous magnesium sulfate. The solvent is distilled off under reduced pressure,
The residue was purified by silica gel column chromatography (eluent: toluene) and then recrystallized (solvent: toluene) to give 2- (trans-4-n-propylcyclohexyl) methyloxy-3,4,5,6-tetra Fluoro-7-n-pentyl-9,10-dihydrophenanthrene ( 7 ) (3.35 g, 0.007 mol; yield 40)
%). MS / 477 (M ^<+> ), [Delta] [epsilon] =-10.
4, Δn = 0.144.

According to the method of Example 1, the following compounds can be synthesized.

[0105]

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[0106]

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[0107]

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[0108]

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[0109]

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[0110]

As described above, according to the present invention, a negative dielectric anisotropy value having a large absolute value, a low viscosity, a controlled optical anisotropy value, a high specific resistance value and a high It is possible to provide a liquid crystal compound which has a voltage holding ratio and is stable against heat or ultraviolet irradiation, a liquid crystal composition containing the same, and a liquid crystal display device manufactured using the liquid crystal composition. Was.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C07D 307/91 C07D 307/91 309/04 309/04 319/06 319/06 333/76 333/76 335/04 335/04 345/00 345/00 C07F 7/08 C07F 7/08 R C07J 9/00 C07J 9/00 C09K 19/32 C09K 19/32 19/34 19/34 19/42 19/42 G02F 1/13 500 G02F 1 / 13 500

Claims (14)

[Claims] 1. A liquid crystalline compound having a structure represented by the general formula (1) in a skeleton structure. Embedded image (Wherein G is an alkylene group having 1 to 6 carbon atoms, an oxygen atom,
An imino group in which a sulfur atom, a selenium atom, and a hydrogen atom may be substituted with an alkyl group having 1 to 10 carbon atoms, and a silylene in which at least one hydrogen atom may be substituted with an alkyl group having 1 to 10 carbon atoms Or one or more non-adjacent methylene groups in the alkylene group is an oxygen atom, a sulfur atom, a selenium atom, a nitrogen atom, -C≡C-,
One or more hydrogen atoms may be substituted with a silylene group which may be substituted with an alkyl group having 1 to 10 carbon atoms, or a vinylene group, and each atom constituting the compound is an isotope thereof. It may be substituted. ) 2. The structure represented by the general formula (1) is 3, 4,
The liquid crystal compound according to claim 1, which is a 5,6-tetrafluoro-9,10-dihydrophenanthrene-2,7-diyl group. 3. A compound of the general formula (2) (In the formula (2), R ¹ and Y ¹ each independently have 1 to 2 carbon atoms.
0 alkyl group, hydrogen atom, halogen atom, cyano group,
Represents a cyanate group, an isocyano group or an isothiocyanate group, wherein one or more non-adjacent methylene groups in the alkyl group are an oxygen atom, a sulfur atom, a nitrogen atom, -C≡C-,
One or more hydrogen atoms may be substituted with a silylene group which may be substituted with an alkyl group having 1 to 10 carbon atoms, or a vinylene group, and one or more hydrogen atoms in these alkyl groups may be It may be substituted by a fluorine atom or a chlorine atom, and these alkyl groups may be optically active, and X ¹ , X ² , X ³ and X ⁴ each independently represent a single bond,-
(CH ₂ ) ₂ —, —CH ＝ CH—, —C≡C—, —COO
-, - OCO -, - CH 2 O -, - OCH 2 -, - (CH
_{2) 4 -, - (CH} 2) 3 O -, - O (CH 2) 3 -, - CH
ＣＨCHCH ₂ CH ₂ —, —CH ₂ CHＣＨCHCH ₂ —, —C
_{H 2 CH 2 CH = CH -} , - CH = CHCH = CH -, -
_{CF 2 O -, - OCF 2} -, - CH = CHCH 2 O -, -
_{OCH 2 CH = CH -, -} CF = CF -, - CH 2 CF 2
_{-, - CF 2 CH 2 -} , - (CF 2) 2 -, - (CF 2)
_{4 -, - (CH 2)} 2 COO -, - OCO (CH 2) 2 -,
-CH = CHCOO-, -OCOCH = CH-, -CH
ＣＨCHC≡C— or —C≡CCH ＝ CH—, and a ring A
¹ , ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ are each independently trans-cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-diyl, 1,4-phenylene, represents bicyclo [1.1.1] pentane-1,3-diyl, or a group represented by the following general formula (1), these rings a ^1,
At least one of the ring A ² , the ring A ³ , the ring A ⁴ and the ring A ⁵ is a group represented by the general formula (1), and a carbon atom constituting these rings is a nitrogen atom, an oxygen atom or a sulfur atom. May be substituted with an atom, a hydrogen atom on the ring may be substituted with a halogen atom or a cyano group, and these rings may be optically active; (In the formula (1), G represents an alkylene group having 1 to 6 carbon atoms, an oxygen atom, a sulfur atom, a selenium atom, and a hydrogen atom having 1 to 1 carbon atoms.
An imino group which may be substituted with an alkyl group of 0, a silylene group wherein at least one hydrogen atom may be substituted with an alkyl group having 1 to 10 carbon atoms, or -SO-; One or more methylene groups that are not adjacent to each other are an oxygen atom, a sulfur atom, a selenium atom, a nitrogen atom, -C≡.
C- One or more hydrogen atoms may be substituted with a silylene group which may be substituted with an alkyl group having 1 to 10 carbon atoms, or a vinylene group. ), A ¹ , a ² , a ³ , a ⁴ and a ⁵ each independently represent 0 or 1, and a ¹ + a ² + a ³ + a ⁴ + a ⁵ ≧ 1 and constitutes this compound Each atom may be substituted with its isotope. The liquid crystalline compound according to claim 1, which is represented by the formula: 4. A compound of the general formula (2) (Wherein, R ¹ and Y ¹ each independently represent an alkyl group having 1 to 20 carbon atoms, a hydrogen atom, a halogen atom, a cyano group, a cyanate group, an isocyano group, or an isothiocyanate group; One or more methylene groups which are not adjacent to each other are an oxygen atom, a sulfur atom, a nitrogen atom, -C≡C-, and a silylene group in which one or more hydrogen atoms may be substituted by an alkyl group having 1 to 10 carbon atoms Or one or more hydrogen atoms in these alkyl groups may be substituted with a fluorine atom or a chlorine atom, and these alkyl groups may be optically active. Well,
X ¹ , X ² , X ³ and X ⁴ are each independently a single bond,-(CH
₂ ) _2- , -CH = CH-, -C≡C-, -COO-,-
_{OCO -, - CH 2 O -} , - OCH 2 -, - (CH 2)
_{4 -, - (CH 2)} 3 O -, - O (CH 2) 3 -, - CH =
CHCH ₂ CH ₂ —, —CH ₂ CH = CHCH ₂ —, —CH
₂ CH ₂ CH = CH-, -CH = CHCH = CH-, -C
_{F 2 O -, - OCF 2} -, - CH = CHCH 2 O -, - O
_{CH 2 CH = CH -, -} CF = CF -, - CH 2 CF
_{2 -, - CF 2 CH 2} -, - (CF 2) 2 -, - (CF 2) 4
_{-, - (CH 2) 2} COO -, - OCO (CH 2) 2 -, -
CH = CHCOO-, -OCOCH = CH-, -CH =
CHC≡C— or —C≡CCH ＝ CH—, wherein ring A ¹ , ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ are each independently trans-cyclohexane-1,4-diyl, cyclohexa -1-ene-1,4-diyl, 1,4-phenylene,
Represents bicyclo [1.1.1] pentane-1,3-diyl or 3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene-2,7-diyl;
¹ , at least one of ring A ² , ring A ³ , ring A ⁴ and ring A ⁵ is 3,4,5,6-tetrafluoro-9,10-dihydrophenanthrene-2,7-diyl; The carbon atoms constituting the ring may be substituted with a nitrogen atom, an oxygen atom or a sulfur atom, the hydrogen atom on the ring may be substituted with a halogen atom or a cyano group. A ¹ , a ² , a ³ , a ⁴ and a
⁵ independently represents 0 or 1, but a ¹ + a ² + a ³ + a ⁴ + a ⁵ ≧ 1, and each atom constituting the compound may be substituted with its isotope. The liquid crystalline compound according to claim 1, which is represented by the formula: 5. A liquid crystal composition comprising at least two components, comprising at least one liquid crystal compound according to claim 1. Description: 6. A compound comprising at least one compound according to claim 1 as a first component, and a compound represented by general formulas (3), (4) and (5) as a second component. A liquid crystal composition comprising at least one compound selected from the group consisting of: Embedded image (Wherein, R ² represents an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group may be substituted with an oxygen atom or —CH ＝ CH—,
One or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, and Y ² is a fluorine atom, a chlorine atom, —OCF ₃ , —OCF ₂ H, —CF ₃ , —CF ₂ H ,
-CFH _2, -OCF ₂ CF ₂ H or -OCF ₂ CFHCF
₃ represents, L ¹ and L ² represents a hydrogen atom or a fluorine atom each independently, Z ¹ and Z ² are each independently - (CH _{2) 2
-, - (CH 2) 4} -, - COO -, - CF 2 O -, - O
CF ₂ —, —CH ＝ CH— or a single bond, and ring Q ¹ is trans-cyclohexane-1,4-diyl, 1,3-dioxane-2,5-diyl, or a hydrogen atom is substituted by a fluorine atom. And ring Q ² is trans-cyclohexane-1,4-diyl or 1,4 optionally substituted with a hydrogen atom by a fluorine atom.
Represents phenylene, and each atom constituting these compounds may be substituted with its isotope. ) 7. A compound comprising at least one compound according to any one of claims 1 to 4 as a first component, and a compound represented by general formulas (6) and (7) as a second component. A liquid crystal composition comprising at least one selected compound. Embedded image (Wherein, R ³ and R ⁴ each independently represent an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group are substituted with an oxygen atom or —CH ＝ CH—. may be, also, one or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, Y ³
Represents a cyano group or —C≡C—CN, and ring Q ³ represents trans-cyclohexane-1,4-diyl, 1,4-phenylene, 1,3-dioxane-2,5-diyl or pyrimidine-2,5. A ring Q ⁴ represents trans-cyclohexane-1,4-diyl, pyrimidine-2,5-diyl, or 1,4-phenylene in which a hydrogen atom may be substituted by a fluorine atom; ⁵ represents trans-cyclohexane-1,4-diyl or 1,4-phenylene, Z ³ represents — (CH ₂ ) ₂ —, —COO— or a single bond, and L ³ , L ⁴ and L ⁵ each represent Each independently represents a hydrogen atom or a fluorine atom, and b, c and d each independently represent 0 or 1
And the atoms constituting these compounds may be substituted with their isotopes. ) 8. A compound comprising at least one compound according to claim 1 as a first component, and a compound represented by the above general formula (3), (4) or (5) as a second component. And at least one compound selected from the group consisting of compounds represented by the following general formulas (8), (9) and (1).
A liquid crystal composition comprising at least one compound selected from the group consisting of 0). Embedded image (Wherein, R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group are substituted with an oxygen atom or —CH ＝ CH—. And at least one hydrogen atom in the alkyl group may be substituted with a fluorine atom.
^6, ring Q ⁷ and ring Q ⁸ are each independently trans - cyclohexane-1,4-diyl, pyrimidine-2,5-diyl, or a hydrogen atom may be substituted with a fluorine atom 1,4 Represents phenylene, and Z ⁴ and Z ⁵ are each independently —C≡C—, —COO—, — (CH ₂ ) ₂ —, —CH
ＣＨCH— or a single bond, and the atoms constituting these compounds may be substituted with their isotopes. ) 9. A compound comprising at least one compound according to claim 1 as a first component, and a compound represented by general formulas (11), (12) and (13) as a second component. A liquid crystal composition comprising at least one compound selected from the group consisting of: Embedded image (Wherein, R ⁷ and R ⁸ each independently represent an alkyl group having 1 to 10 carbon atoms, and one or more non-adjacent methylene groups in the alkyl group are substituted with an oxygen atom or —CH ＝ CH—. And at least one hydrogen atom in the alkyl group may be substituted with a fluorine atom.
⁹ and ring Q ¹⁰ are each independently trans - represents a cyclohexane-1,4-diyl or 1,4-phenylene, L
⁶ and L ⁷ each independently represent a hydrogen atom or a fluorine atom but do not represent a hydrogen atom at the same time, and Z ⁶ and Z ⁷ each independently represent-(CH ₂ ) _2- , -COO- or The atoms representing a bond and constituting these compounds may be substituted with their isotopes. ) 10. A compound comprising at least one compound according to any one of claims 1 to 4 as a first component, and the compounds represented by the general formulas (8), (9) and (10) as a second component. And at least one compound selected from the group consisting of the compounds represented by the above general formulas (11) and (1).
A liquid crystal composition comprising at least one compound selected from the group consisting of compounds (2) and (13). 11. A compound group comprising at least one compound according to any one of claims 1 to 4 as a first component, and a compound group comprising the general formulas (6) and (7) as a second component. Containing at least one compound selected from
As the third component, the above general formulas (8), (9) and (1)
A liquid crystal composition comprising at least one compound selected from the group consisting of 0). 12. A compound containing at least one compound according to any one of claims 1 to 4 as a first component, and a compound represented by the above general formula (3), (4) or (5) as a second component. And at least one compound selected from the group consisting of the compounds represented by formulas (6) and (7)
At least one compound selected from the group consisting of
Contains, as the fourth component, the general formula (8),
A liquid crystal composition comprising at least one compound selected from the group consisting of compounds (9) and (10). 13. A liquid crystal composition characterized by further comprising one or more optically active compounds in addition to the liquid crystal composition according to claim 5. Description: 14. A liquid crystal display device comprising the liquid crystal composition according to claim 5. Description: