CN1911880A - Multifluoro substituted diphenyl acetylene derivative, composition containing multifluoro substituted diphenyl acetylene derivatire, its preparation method and use - Google Patents
Multifluoro substituted diphenyl acetylene derivative, composition containing multifluoro substituted diphenyl acetylene derivatire, its preparation method and use Download PDFInfo
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Abstract
The present invention relates to one kind of polyfluoro substituted diphenyl acetylene derivative and its composition, preparation process and use as the liquid crystal material for display. The polyfluoro substituted diphenyl acetylene derivative has the general expression as shown, great optical anisotropy, relatively low viscosity, relatively wide nematic phase temperature range, excellent low temperature compatibility, facile material, and simple and feasible synthetic path, and is suitable for use as displaying liquid crystal material with improved response speed and driving voltage. The liquid crystal composition has excellent performance, including greatly improved response speed and low temperature compatibility, and may be used in liquid crystal display of TN mode, STN mode, TFT mode, etc.
Description
Technical field
The composition, its preparation method and the conduct demonstration thereof that the present invention relates to a kind of multifluoro substituted diphenyl acetylene derivatire, contain multifluoro substituted diphenyl acetylene derivatire belong to the compound field with the purposes of liquid crystal material.
Background technology
Liquid crystal material wherein shows with nematic phase material it is one type of liquid crystal material with fastest developing speed, market occupancy volume maximum along with the development of liquid-crystal display develops rapidly.Nematic liquid crystal shows TN (twisted-nematic phase) pattern, liquid-crystal displays such as STN (supertwist nematic phase) pattern, TFT (thin film transistor) pattern.Be widely used in the demonstrations such as clock and watch, electronic calculator, PDA, cell phone, intelligent terminal and portable computer, TV-LCD.Particularly enter 21 century, along with developing rapidly of information technology, response speed and image quality are had higher requirement, this has proposed higher performance requriements just for the liquid crystal material.
Also be accompanied by the development of liquid-crystal display and grow in strength as the liquid crystal material that shows usefulness, a large amount of liquid crystalline cpds occurred.From azo, azoxy, benzal, biphenyl nitrile, ester class, oxygen heterocyclic ring class, pyrimidine lopps liquid crystalline cpd develops into cyclohexyl (connection) benzene class, diphenyl acetylene class, ethyl bridged bond class, end alkene class and fluorine-containing aromatic ring class liquid crystalline cpd, its molecular structure is more and more stable, and performance characteristics is outstanding more, constantly satisfies the requirement of display performances such as TN-LCD, STN-LCD, TFT-LCD, PDLCD.
The fluorinated liquid crystal material had obtained development rapidly in recent years, the exploitation of nearly all nematic phase material all is as main ingredient with the fluorinated liquid crystal compound, be widely used among TN-LCD, STN-LCD, the TFT-LCD, especially indispensable especially in TFT-LCD.
According to the service requirements of display device, liquid crystalline cpd should satisfy following performance requriements:
1. liquid crystal material is colourless, to light, thermally-stabilised and electric, chemically stable;
2. very wide nematic phase range is arranged;
3. photoelectric response speed is fast;
4. require low driving voltage;
5. voltage-light transmission characteristic increases soon, and the temperature dependency of voltage is little.
6. wide visual angle.
1. a lot of liquid crystal materials can satisfy, but from 2.～6. there not being any monomer liquid crystal to satisfy.
We know that there is following relationship the time of response (τ) with rotary viscosity (γ) and box thick (d): τ ∝ γ d.Promptly in order to satisfy characteristic 3., d must be little, to improve response speed.Because to specific display format, Δ nd is fixed normally, and therefore, about 0.2 for realizing liquid crystal material Δ n value, monomeric Δ n value must reach 0.25～0.35 scope, is satisfying under the processing requirement, and d is the smaller the better, and promptly optical anisotropy (Δ n) will increase.
In order to obtain the required various characteristics of display format, liquid crystal material uses with the form of mixtures of various liquid crystalline cpds usually, therefore, needs liquid crystalline cpd to have good mutual solubility, particularly at low temperatures.
But along with the increase of Δ n, the intermiscibility variation of itself and other liquid crystal becomes more especially at low temperatures.In order to change these deficiencies, increase the molecule width by in the liquid crystalline cpd structure, introducing fluorine atom, can reduce fusing point, increase intermiscibility.People's design synthesizes some hexanaphthene diphenyl acetylene derivatires and fluorine substituted diphenyl acetylene derivatire.As U.S.Pat.No.5,437,815 and the liquid crystalline cpd mentioned of JP-A 63-15234:
C-Sm：43℃，Sm-N：90℃，N-I：159℃。
C-N：108℃，N-I：256℃。
C-Sm：120℃，Sm-N：163℃，N-I：198℃。
Though above-mentioned liquid crystalline cpd Δ n is big, nematic temperature range is very wide,, the intermiscibility of itself and other liquid crystalline cpd is still limited, intermiscibility especially at low temperatures.
Summary of the invention
The object of the present invention is to provide a kind of multifluoro substituted diphenyl acetylene derivatire, and contain the composition of multifluoro substituted diphenyl acetylene derivatire.
Another object of the present invention is to provide a kind of preparation method of multifluoro substituted diphenyl acetylene derivatire.
The composition that a further object of the present invention is a kind of derivative of multifluoro substituted diphenyl acetylene to be provided and to contain multifluoro substituted diphenyl acetylene derivatire is as the purposes that shows with liquid crystal material.
The invention provides a kind of multifluoro substituted diphenyl acetylene derivatire, this compound has the structure shown in the general formula (I):
Wherein:
R is C
1-C
10Alkyl or C
1-C
10Alkoxyl group; X
1, X
2, X
3Be respectively fluorine atom or hydrogen atom, and X
2, X
3At least one is a fluorine atom, but X
1, X
2, X
3Be not fluorine atom simultaneously; Y is C
1-C
10Alkyl or C
1-C
10Alkoxyl group ,-F ,-OCF
3Or-OCHF
2In a kind of.
Further, R is preferably C
1-C
10Straight chained alkyl or C
1-C
10The straight chain alkoxyl group; Y is preferably C
1-C
10Straight chained alkyl or C
1-C
10The straight chain alkoxyl group;
More preferably, R C more preferably
1-C
7Straight chained alkyl or C
1-C
7The straight chain alkoxyl group; Y is C
1-C
7Straight chained alkyl;
Most preferably, R is-CH
3,-C
2H
5,-C
3H
7,-C
4H
9Or-C
5H
11Y is-CH
3Or-C
3H
7
The structure of described compound specifically is expressed as follows:
Wherein R is C
1-C
7Straight chained alkyl.
The present invention also provides a kind of preparation method of multifluoro substituted diphenyl acetylene derivatire.This method comprises the steps:
(1) para-orientation bromobenzene (a) and 2,3-two fluorobenzoic boric acids or 3-fluorobenzoic boric acid (b) are at Pd[0] under the catalysis coupling generate 4`-and replace-2,3-DfBP or 4`-replacement-3-fluorine biphenyl (c);
(2) compound (c) reacts with butyllithium at low temperatures becomes metallic lithium reagent, gets 4`-again with Iod R and replaces-2,3-difluoro iodo biphenyl or 4`-replacement-3-fluorine iodo biphenyl (d);
(3) compound (e) and 3-methyl isophthalic acid-butine-3-alcohol coupling gets compound (f), again deprotection and must terminal alkyne compound (g) under KOH effect;
(4) compound (d) and compound (g) are at Pd[0] under (zeroth order palladium) catalysis coupling generate target compound (I).
Reaction process is as follows:
Wherein:
R is C
1-C
10Alkyl or C
1-C
10Alkoxyl group; X
1, X
2, X
3Be respectively fluorine atom or hydrogen atom, and X
2, X
3At least one is a fluorine atom, but X
1, X
2, X
3Be not fluorine atom simultaneously; Y is C
1-C
10Alkyl or C
1-C
10Alkoxyl group ,-F ,-OCF
3Or-OCHF
2In a kind of.
Further, R is preferably C
1-C
10Straight chained alkyl or C
1-C
10The straight chain alkoxyl group; Y is preferably C
1-C
10Straight chained alkyl or C
1-C
10The straight chain alkoxyl group;
More preferably, R C more preferably
1-C
7Straight chained alkyl or C
1-C
7The straight chain alkoxyl group; Y is C
1-C
7Straight chained alkyl;
Most preferably, R is-CH
3,-C
2H
5,-C
3H
7,-C
4H
9Or-C
5H
11Y is-CH
3Or-C
3H
7
When a kind of multifluoro substituted diphenyl acetylene derivatire of the present invention is used to prepare liquid-crystal composition, comprise the compound shown in 1～30wt% general formula (I) in the described liquid-crystal composition, wherein be preferably 2～20wt%, most preferably be 3～10wt%, surplus is known other liquid crystalline cpds of other prior art.
The known liquid crystalline cpd of described prior art, the compound shown in preferred (II)-(X), but be not limited to them:
Product of the present invention has bigger optical anisotropy (Δ n) and less viscosity; the nematic temperature range of broad; has good compatibility at low temperatures; and raw material is easy to get; synthetic route simply should be gone; be fit to large-scale industrial production, be suitable for using liquid crystal material, in order to response speed and the driving voltage that improves liquid-crystal composition as showing.
Because the adding of liquid crystal material of the present invention becomes a kind of liquid-crystal composition with superperformance, the response speed and the low temperature compatibility that show with nematic phase liquid crystal composition have been improved greatly.Can be used in the liquid-crystal displays such as TN pattern, STN pattern and TFT pattern.
Embodiment
Embodiment 1
Present embodiment is 2, the preparation (I-1) of 3-two fluoro-4-(4``-butyl phenyl)-2`-fluoro-4`-methyldiphenyl acetylene
Step 1-1:4`-butyl-2,3-DfBP synthetic:: in there-necked flask, add 25.5g (0.12mol) 4-butyl bromobenzene, 2,3-two fluorobenzoic boric acid 15.8g (0.1mol), yellow soda ash 21.2g (0.2mol), toluene 100ml, ethanol 80ml, water 60ml, Pd[0] 0.5g, logical nitrogen purge gas, reflux 7 hours, cooling, pour in the 1L separating funnel, branch vibration layer is with 25ml toluene extraction 2 times, merge organic layer, be washed to neutrality, evaporate to dryness toluene, 134～136 ℃/3mmHg cut 17.5g is collected in decompression, product gas chromatographic purity 〉=99%, yield 71%.
Step 1-2:4`-butyl-2, synthesizing of 3-difluoro iodo biphenyl: in there-necked flask, add 29.6g (0.12mol) 4`-butyl-2, the 3-DfBP, 200mlTHF cools to-80 ℃, begin to drip the 0.13mol butyl lithium solution, temperature control-70 ℃～-80 ℃, drip off the back and stirred 1 hour, drip 32g (0.125mol) iodine and be dissolved in solution among the 80mlTHF, about temperature control-75 ℃, dripping off the back stirred 0.5 hour, rise to add in the 300ml water after the room temperature and stir 20min, pour in the separating funnel separatory into, water 50ml ethyl acetate extraction 2 times, merge with saturated NaCl solution washing 2 times, evaporate to dryness gets the 37g pale yellow crystals with 2 times of sherwood oil recrystallizations, product gas chromatographic purity 〉=99%, yield 87%.
Synthesizing of step 2-1:2-fluoro-4-methylbenzene acetylene: in there-necked flask, add 3-fluorine 4-toluene bromide 37.8g (0.2mol), triethylamine 100ml, triphenylphosphine 2g, Pd[0] 0.5g, 0.5gCuBr and 2gLiBr and the adding of 50mlTHF wiring solution-forming.Add 21.8g3-methyl isophthalic acid-butine-3-alcohol (0.3mol) in the dropping funnel.Feed nitrogen purge gas, be heated to 60 ℃ and begin to drip 3-methyl isophthalic acid-butine-3-alcohol, finish, keep 50～60 ℃ of reactions 5 hours, cooling is filtered, with toluene 200ml flush cake.Solution is poured in the separating funnel, adds the saturated NH of 1L
4The Cl solution washing is used 500ml * 2 water washings again, evaporate to dryness toluene, and 110 ℃/3mmHg cut is collected in decompression.Get 35g.Product gas chromatographic purity 〉=95%, yield: 91%.
Step 2-2: add product, 20g KOH, the 150ml toluene of step 2-1 in there-necked flask, reflux 5 hours adds 200ml water, separatory, extraction, water washing is to neutrality, evaporate to dryness toluene, 60 ℃/10mmHg product 16g, product gas chromatographic purity 〉=95%, productive rate: 60% are collected in decompression;
Step 3:2, synthesizing of 3-difluoro 4-(4`` butyl phenyl)-2`-fluoro-4`-methyldiphenyl acetylene: add 4`-butyl-2 in the there-necked flask, 3-difluoro iodo biphenyl 41g (0.11mol), cuprous iodide 2g, triphenylphosphine 4g, Pd[0] 1g, triethylamine 30ml, toluene 200ml.Add 2-fluoro-4-methylbenzene acetylene 14.9g (0.11mol) in the dropping funnel, logical N
2Emptying gas is warming up to 35 ℃, begins to drip alkynes, drips off to rise to 50 ℃ of reactions 6 hours, the salt that reaction filter to generate, washes merging solution 500ml10%NH with 200ml * 2 toluene
4The Cl washing, evaporate to dryness toluene adds the 150ml petroleum ether dissolution, purifies with column chromatography, with 3 times of sherwood oil recrystallizations, gets 26g, gas chromatographic purity 〉=99.6%, yield 63%.
Experimental result is as follows:
(1) compound phase texture: C46.30 ℃ N158.02 ℃ I
(2) MS analytical data:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 25H 21F 3 | 378(M +、74.73)、335(100)、319(8.56)、167(4.03) |
(3) ultimate analysis:
Calculated value: C (79.35%), H (5.59%);
Experimental value: C (79.32%), H (5.60%).
Embodiment 2
Present embodiment is 2, the preparation (I-2) of 3-two fluoro-4-(4``-butyl phenyl)-3`-fluoro-4`-methyldiphenyl acetylene
Preparation process embodiment 1, difference is the raw material 3-fluoro-4-toluene bromide among the step 2-1 is replaced by 2-fluoro-4-toluene bromide, prepare 3-fluoro-4-methylbenzene acetylene, again with the product 4`-butyl-2 of step 1-2,3-difluoro iodo biphenyl carries out coupling, purification obtains target compound (I-2) through recrystallization, and total recovery is 34%.
Experimental result is as follows:
(1) compound phase texture: C56.85 ℃ S
m59.19 ℃ N133.29 ℃ I.
(2) MS analytical data:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 25H 21F 3 | 378(M +、58.97)、335(100)、319(11.38)、167(6.06) |
(3) ultimate analysis:
Calculated value: C (79.35%), H (5.59%);
Experimental value: C (79.33%), H (5.60%).
Embodiment 3
Present embodiment is 2, the preparation (I-3) of 3-two fluoro-4-(4``-butyl phenyl)-2`-fluoro-4`-propyl group tolane:
Preparation process is with embodiment 1, and difference is to change the raw material 3-fluoro-4-toluene bromide among the step 2-1 into 3-fluoro-4-bromine propyl benzene.
Experimental result is as follows:
(1) compound phase texture: C46.57 ℃ N158.03 ℃ I
(2) MS mass spectroscopy:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 27H 25F 3 | 406(M +、100)、377(20.75)、363(88.37)、334(52.12)、167(11.79) |
(3) ultimate analysis:
Calculated value: C (79.78%), H (6.20%);
Experimental value: C (79.77%), H (6.18%).
Embodiment 4
Present embodiment is the preparation process of 2-fluoro-4-(4``-butyl phenyl)-2`-fluoro-4`-methyldiphenyl acetylene (I-4).
Preparation process is with embodiment 1.The reactant 2 of difference in step 1-1,3-two fluorobenzoic boric acids are changed to the 3-fluorobenzoic boric acid, make 4`-butyl-3-fluorine biphenyl; And then step 1-2 obtains 4`-butyl-2-fluorine iodo biphenyl; Finally obtain 2-fluoro-4-(4``-butyl phenyl)-2`-fluoro-4`-methyldiphenyl acetylene.
Experimental result is as follows:
(1) compound phase texture: C52.42 ℃ N170.70 ℃ I;
(2) MS mass spectroscopy:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 25H 22F 2 | 360(M+、63.83)、317(100)、301(10.48)、158(6.46) |
(3) ultimate analysis: calculated value: C (83.31%), H (6.15%);
Experimental value: C (83.29%), H (6.13%).
Embodiment 5
Present embodiment is the preparation of compound 2-fluoro-4-(4``-butylbenzene)-3`-fluoro-4`-methyldiphenyl acetylene (I-5).
Preparation process is with embodiment 4.The reactant 3-fluorine 4-toluene bromide of difference in step 2-1 is changed to 2-fluorine 4-toluene bromide, makes 3-fluoro-4-methylbenzene acetylene; Finally obtain 2-fluoro-4-(4``-butylbenzene)-3`-fluoro-4`-methyldiphenyl acetylene.
The compound experimental result:
(1) compound phase texture: C74.25 ℃ S
m77.68 ℃ N151.46 ℃ I;
(2) MS mass spectroscopy:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 25H 22F 2 | 360(M +、68.44)、317(100)、301(12.31)、158(5.63) |
(3) ultimate analysis: calculated value: C (83.31%), H (6.15%);
Experimental value: C (83.29%), H (6.14%).
Embodiment 6
Present embodiment is the preparation of compound 2-fluoro-4-(4``-butyl phenyl)-2`-fluoro-4`-propyl group tolane (I-6).
Preparation process is with embodiment 4.The reactant 3-fluorine 4-toluene bromide of difference in step 2-1 is changed to 3-fluorine 4-bromine propyl benzene, makes 3-fluoro-4-propylbenzene acetylene; Finally obtain 2-fluoro-4-(4``-butyl phenyl)-2`-fluoro-4`-propyl group tolane.
Experimental result:
(1) compound phase texture: C59.12 ℃ N169.04 ℃ I.
(2) MS mass spectroscopy:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 27H 26F 2 | 388(M+、100)、359(25.33)、345(77.39)、316(57.40)、158(13.76) |
(3) ultimate analysis: calculated value: C (83.47%), H (6.74%),
Experimental value: C (83.47%), H (6.75%).
Embodiment 7
Present embodiment is the preparation of compound 2-fluoro-4-(4`-ethylphenyl)-2`-fluoro-4`-propyl group tolane (I-7).
Preparation process is with embodiment 6.The reactant 4-butyl bromobenzene of difference in step 1-1 is changed to the 4-ethyl bromobenzene, makes product 4`-ethyl-3-fluorine biphenyl of step 1-1, and then obtains product 4`-ethyl-2-fluorine iodo biphenyl of step 1-2; Finally obtain 2-fluoro-4-(4`-ethylphenyl)-2`-fluoro-4`-propyl group tolane.
Experimental result:
(1) compound phase texture: C72.33 ℃ N176.50 ℃ I
(2) MS mass spectroscopy:
| Molecular formula | Characteristic ion (M/Z +) and abundance (%) |
| C 25H 22F 2 | 360(M +、100)、345(12.14)、331(70.57)、316(31.49)、158(13.20) |
(3) ultimate analysis:
Calculated value: C (83.31%), H (6.15%),
Experimental value: C (83.30%), H (6.16%).
Embodiment 8～11
With reference to embodiment 1, the reactant 4-butyl bromobenzene among the step 1-1 is changed to 4-methyl bromobenzene, 4-propyl group bromobenzene, 4-amylic phenyl-bromide and 4-heptyl bromobenzene respectively, all the other raw materials are identical with operation, obtain following compound:
Embodiment 12～14
With reference to embodiment 3, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-propyl group bromobenzene, 4-amylic phenyl-bromide and 4-heptyl bromobenzene respectively, all the other raw materials are identical with operation, obtain following compound:
Embodiment 15
With reference to embodiment 1, the reactant 4-butyl bromobenzene among its step 1-1 is changed to the 4-ethyl bromobenzene; Reactant 3-fluorine 4-toluene bromide among its step 2-1 is changed to 3-fluorine 4-bromine ethylbenzene, and all the other raw materials are identical with operation, obtain following compound:
Embodiment 16
With reference to embodiment 1, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-propyl group bromobenzene; Reactant 3-fluorine 4-toluene bromide among its step 2-1 is changed to 3-fluorine 4-bromine penta benzene, and all the other raw materials are identical with operation, obtain following compound:
Embodiment 17-19
With reference to embodiment 2, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-methyl bromobenzene, 4-propyl group bromobenzene, 4-amylic phenyl-bromide respectively, all the other raw materials are identical with operation, obtain following compound:
Embodiment 20
With reference to embodiment 1, the reactant 4-butyl bromobenzene among its step 1-1 is changed to the 4-ethyl bromobenzene; Reactant 3-fluoro-4-toluene bromide among its step 2-1 is changed to 3-fluoro-4-bromine ethylbenzene, and all the other raw materials are identical with operation, obtain following compound:
Embodiment 21
With reference to embodiment 5, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-propyl group bromobenzene, all the other raw materials are identical with operation, obtain following compound:
Embodiment 22
With reference to embodiment 4, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-propyl group bromobenzene, all the other raw materials are identical with operation, obtain following compound:
Embodiment 23
With reference to embodiment 6, the reactant 4-butyl bromobenzene among its step 1-1 is changed to the 4-amylic phenyl-bromide, all the other raw materials are identical with operation, obtain following compound:
Embodiment 24-26
With reference to the content of embodiment 4 step 1-1,1-2, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-propyl group bromobenzene, 4-amylic phenyl-bromide, 4-heptyl bromobenzene respectively, preparation process 1-2 product is respectively:
With reference to step 2-1, the 2-2 of embodiment 1, the 3-fluorine 4-toluene bromide among the step 2-1 is changed to 2,3-two fluoro-4-bromine propyl benzene, preparation process 1-2 product is:
With reference to the step 3 of embodiment 1, compd B-1 is reacted with A-1, A-2, A-3 respectively, get following compound:
Embodiment 27-28
With reference to the content of embodiment 4 step 1-1,1-2, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-methyl bromobenzene, 4-propyl group bromobenzene respectively, preparation process 1-2 product is respectively:
With reference to step 2-1, the 2-2 of embodiment 1, the 3-fluorine 4-toluene bromide among the step 2-1 is changed to 2,3-two fluoro-4-toluene bromides, preparation process 1-2 product is:
With reference to the step 3 of embodiment 1, Compound C-1, C-2 are reacted with D-1 respectively, get following compound:
Embodiment 29
With reference to the content of embodiment 4 step 1-1,1-2, the reactant 4-butyl bromobenzene among its step 1-1 is changed to 4-propyl group bromobenzene respectively, preparation process 1-2 product is:
With reference to step 2-1, the 2-2 of embodiment 1, the 3-fluorine 4-toluene bromide among the step 2-1 is changed to 2,3-two fluoro-4-bromine ethylbenzene, preparation process 1-2 product is:
With reference to the step 3 of embodiment 1, above-mentioned two compounds are carried out linked reaction, get following compound:
Embodiment 30-39
With reference to concrete preparation process of embodiment 1-29 compound and liquid crystal chemosynthesis knowledge, the preparation following compounds:
Above-claimed cpd can adopt method disclosed by the invention synthetic.-OCHF
2,-OCF
3The compound that replaces also is the group that liquid crystalline cpd institute often adopts, and can adopt similar the present invention's method synthetic, and this is known for those skilled in the art, here description no longer one by one.
Experimental example 1
This experimental example is that the liquid crystal property of embodiment of the invention 1-5 product compound compares:
| Compound | Optical anisotropy | Dielectric anisotropy | Threshold voltage (V) | Steepness | Clearing point (℃) | |||
| n 0 | n e | Δn | Δε | V 90 | V 10 | P | C P | |
| I-1 | 1.521 | 1.8672 | 0.3462 | 0.7 | 3.57 | 4.39 | 1.227 | 158.6 |
| I-2 | 1.523 | 1.8492 | 0.3262 | 0.1 | 3.18 | 3.02 | 0.867 | 133.8 |
| I-3 | 1.523 | 1.8622 | 0.3392 | 0 | 3.47 | 4.68 | 1.417 | 158 |
| I-4 | 1.534 | 1.8942 | 0.3602 | 2.9 | 2.88 | 3.51 | 1.257 | 151.5 |
| I-5 | 1.531 | 1.9172 | 0.3862 | 1.4 | 3.47 | 4.29 | 1.297 | 171 |
From the liquid crystal property parameter of above compound as can be seen, The compounds of this invention has the necessary characteristic as liquid crystal material, has bigger optical anisotropy, wide temperature range is arranged, as showing the response speed and the driving voltage that can improve liquid-crystal composition with liquid crystal material, can be used in TN pattern, STN pattern and the TFT mode display.
Claims (10)
1, a kind of multifluoro substituted diphenyl acetylene derivatire is characterized in that, described compound has the structure shown in the general formula (I):
Wherein:
R is C
1-C
10Alkyl or C
1-C
10Alkoxyl group;
X
1, X
2, X
3Be respectively fluorine atom or hydrogen atom, and X
2, X
3At least one is a fluorine atom, but X
1, X
2, X
3Be not fluorine atom simultaneously;
Y is C
1-C
10Alkyl or C
1-C
10Alkoxyl group ,-F ,-OCF
3Or-OCHF
2In a kind of.
2, derivative according to claim 1 is characterized in that, in the described compound,
R is C
1-C
10Straight chained alkyl or C
1-C
10The straight chain alkoxyl group;
Y is C
1-C
10Straight chained alkyl or C
1-C
10The straight chain alkoxyl group.
3, derivative according to claim 2 is characterized in that, in the described compound,
R is C
1-C
7Straight chained alkyl or C
1-C
7The straight chain alkoxyl group;
Y is C
1-C
7Straight chained alkyl.
4, derivative according to claim 3 is characterized in that, in the described compound,
R is-CH
3,-C
2H
5,-C
3H
7,-C
4H
9Or-C
5H
11
Y is-CH
3Or-C
3H
7
5, derivative according to claim 4 is characterized in that, the structure of described compound specifically is expressed as follows:
Wherein R is C
1-C
7Straight chained alkyl.
6, the preparation method of the described multifluoro substituted diphenyl acetylene derivatire of claim 1-5 is characterized in that, described method comprises the steps:
(1) para-orientation bromobenzene (a) and 2,3-two fluorobenzoic boric acids or 3-fluorobenzoic boric acid (b) are at Pd[O] under the catalysis coupling generate 4 '-replace-2,3-DfBP or 4 '-replacement-3-fluorine biphenyl (c);
(2) compound (c) reacts with butyllithium at low temperatures becomes metallic lithium reagent, gets 4 '-replacement-2,3-difluoro iodo biphenyl or 4 '-replacement-3-fluorine iodo biphenyl (d) again with Iod R;
(3) compound (e) and 3-methyl isophthalic acid-butine-3-alcohol coupling gets compound (f), again deprotection and must terminal alkyne compound (g) under KOH effect;
(4) compound (d) and compound (g) are at Pd[O] under the catalysis coupling generate target compound (I).
7, a kind of liquid-crystal composition is characterized in that, comprises the described multifluoro substituted diphenyl acetylene compound of 1～30wt% claim 1-5 in the described liquid-crystal composition, and all the other components are the known liquid crystalline cpd of prior art.
8, composition according to claim 7 is characterized in that, comprises the multifluoro substituted diphenyl acetylene compound shown in 2～20wt% general formula (I) in the described liquid-crystal composition; Most preferably comprise the multifluoro substituted diphenyl acetylene compound shown in 3～10wt% general formula (I).
According to claim 7 or 8 described compositions, it is characterized in that 9, the known liquid crystalline cpd of described prior art is:
R` and R`` are C
1-C
10Alkyl or C
1-C
10Alkoxyl group;
10, the derivative of the described multifluoro substituted diphenyl acetylene of claim 1-5 and the described liquid-crystal composition of claim 7-9 are as the purposes that shows the liquid crystal material aspect.
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