EP0576450A1 - Derives de cyclobutane de methylene - Google Patents

Derives de cyclobutane de methylene

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Publication number
EP0576450A1
EP0576450A1 EP92905642A EP92905642A EP0576450A1 EP 0576450 A1 EP0576450 A1 EP 0576450A1 EP 92905642 A EP92905642 A EP 92905642A EP 92905642 A EP92905642 A EP 92905642A EP 0576450 A1 EP0576450 A1 EP 0576450A1
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Prior art keywords
formula
alkyl
cbu
cyc
compounds
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EP92905642A
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German (de)
English (en)
Inventor
Eike Poetsch
Werner Binder
Thomas Geelhaar
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Merck Patent GmbH
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Merck Patent GmbH
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3066—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers
    • C09K19/3068—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers chain containing -COO- or -OCO- groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C22/00—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C22/00—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom
    • C07C22/02—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom having unsaturation in the rings
    • C07C22/04—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom having unsaturation in the rings containing six-membered aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C25/00—Compounds containing at least one halogen atom bound to a six-membered aromatic ring
    • C07C25/18—Polycyclic aromatic halogenated hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/45—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by condensation
    • C07C45/455—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by condensation with carboxylic acids or their derivatives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/65—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by splitting-off hydrogen atoms or functional groups; by hydrogenolysis of functional groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
    • C07C49/657—Unsaturated compounds containing a keto groups being part of a ring containing six-membered aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
    • C07C49/687—Unsaturated compounds containing a keto groups being part of a ring containing halogen
    • C07C49/697—Unsaturated compounds containing a keto groups being part of a ring containing halogen containing six-membered aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/74—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/04—Systems containing only non-condensed rings with a four-membered ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
    • C07C2601/14—The ring being saturated

Definitions

  • the invention relates to methylene cyclobutane derivatives of formula I
  • R 1 is halogen, CN, CF 3 , -OCF 3 , -OCF 2 H or an unsubstituted or an alkyl or alkenyl or substituted simply by CN, halogen or CF 3
  • Perfluoroalkyl radical with up to 15 carbon atoms, one or more CH 2 groups in these radicals each being independent of one another by -S-, - ⁇ > - / - ⁇ ⁇ ⁇ ⁇ , -0-, -CO-, -CO -0-, -O-CO- or -0-CO-O- can be replaced so that S and / or 0 atoms are not directly linked,
  • Ai and A 2 each independently (a) trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH 2 groups can also be replaced by -O- and / or -S-,
  • residues (a) and (b) can be substituted one or more times by CN or halogen
  • L 1 and L 2 each H, F or Cl
  • X and Y are each independently of one another F, Cl, Br, CF 3 , CN, C0 2 alkyl or alkyl having 1 to 6 carbon atoms, one of the radicals X and Y also H, and m 0, 1, 2 or 3
  • the invention further relates to the use of these compounds as components of liquid-crystalline media and liquid-crystal and electro-optical display elements which contain the liquid-crystalline media according to the invention.
  • the compounds of the formula I can be used as components of liquid-crystalline media, in particular for displays based on the principle of the twisted cell, including its highly twisted variants, such as e.g. STN or SBE, the guest-host effect, the effect of "deformation of aligned phases or the effect of dynamic scattering.
  • the invention was based on the task of finding new stable liquid-crystalline or mesogenic compounds which are suitable as components of liquid-crystalline media and in particular have a comparatively low viscosity and also a medium positive dielectric anisotropy.
  • the compounds of formula I have a wide range of applications. Depending on the selection of the substituents, these compounds can serve as base materials from which liquid-crystalline phases are predominantly composed; but connections of the Formula I liquid-crystalline base materials from other classes of compounds can be added, for example, to influence the dielectric and / or optical anisotropy of such a dielectric and / or to optimize its threshold voltage and / or its viscosity.
  • the compounds of the formula I are colorless and form liquid-crystalline mesophases in a temperature range which is conveniently located for electro-optical use. They are stable chemically, thermally and against light.
  • the invention thus relates to the compounds of the formula I, in particular the optically active compounds of the formula I, in which X and Y are different from one another, and the compounds of the formula IA,
  • the invention relates in particular to compounds of the formula I in which at least one of the radicals A 1 and A 2 is 1,4-phenylene, 1,4-cyclohexylene, pyrimidine-2,5-diy1 or pyridine-2 which is optionally substituted by fluorine , 5-diyl means.
  • the invention furthermore relates to the use of these compounds as components of liquid-crystalline media.
  • the invention further relates to liquid-crystalline media containing at least one compound which is a group of the formula
  • L 1 , L 2 , X and Y have the meaning given, preferably a compound of the formula I, in particular chiral-toned media containing at least one optically active compound of the formula I.
  • Liquid crystal display elements in particular electro-optical display elements, which contain such media, in particular matrix liquid crystal displays.
  • Cbu -CXY in the following means a radical of the formula
  • Cyc is a 1,4-cyclohexylene radical
  • Che is a 1,4-cyclohexylene radical
  • Dio is a 1,3-dioxane-2,5-diyl radical
  • Dit is a 1,3-di-hian-2,5-diyl radical
  • Phe is a 1,4-phenylene radical
  • PheF a 1,4-phenylene radical which is mono- or disubstituted by fluorine
  • Pyd a pyridine-2,5-diyl radical Pyr a pyrimidine-2,5-diyl radical
  • Bi a bicyclo (2 , 2,2) octylene radical
  • Cyc and / or Phe can be unsubstituted or mono- or disubstituted by F or CN.
  • the compounds of the formula I accordingly comprise compounds with two rings of the sub-formulas Ia to Ib:
  • the preferred compounds of sub-formula Ia include those of sub-formulas laa to Iah:
  • sub-formula Ib include those of sub-formulas Iba to Ibm:
  • sub-formula Ic include those of sub-formulas Ica to Icm:
  • sub-formula Id include those of sub-formulas Ida to Idm:
  • the preferred compounds of sub-formula le include those of sub-formulas Iea to Iek:
  • R i _Phe-Cyc-Z i -Cbu CXY Ifk
  • the preferred compounds of the formulas Ig include those of the formulas Iga to Igf:
  • the radicals X and Y are preferably different from one another.
  • the terminal group Cbu CXY thus preferably means a group of the formulas 1 to 8:
  • R 1 is preferably alkyl, furthermore alkoxy.
  • a 1 or A 2 are preferably Phe, Cyc, Che, Pyr or Dio.
  • the compounds of the formula I preferably contain no more than one of the radicals Bi, Pyd, Pyr, Dio or Dit.
  • a 1 and / or A 2 is 1,4-phenylene which is mono- or disubstituted by F or monosubstituted by CN.
  • these are 2-fluoro-1,4-phenylene. 3-fluoro-l, 4-phenylene and 2,3-difluoro-l, 4-phenylene, 2,6-difluoro-l, 4-phenylene, 3,5-difluoro-l, 4-phenylene and 2-cyano -l, -phenylene and 3-cyano-l, 4-phenylene.
  • Z 1 and Z 2 are preferably a single bond, -CO-O-, -O-CO- and -CH 2 CH -, in the second place preferably -CH 2 0-and
  • R 1 is an alkyl radical or an alkoxy radical, this can be straight-chain or branched. It is preferably straight-chain, has 2, 3, 4, 5, 6 or 7 carbon atoms and accordingly preferably means ethyl, propyl, butyl, pentyl, hexyl, heptyl, ethoxy, propoxy, butoxy, pentoxy, hexoxy or heptoxy, also methyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, methoxy, octoxy, nonoxy, decoxy, undecoxy, dodecoxy, tridecoxy or tetradecoxy.
  • R 1 is an alkenyl radical, this can be straight-chain or branched. It is preferably straight-chain and has 2 to 10 carbon atoms. Accordingly, it means especially vinyl, prop-1-, or prop-2-enyl, but-1-, 2- or but-3-enyl, pent-1-, 2-, 3- or pent-4-enyl, hex -1-, 2-, 3-, 4- or
  • R 1 is an alkyl radical in which one CH 2 group has been replaced by -0- and one has been replaced by -CO-, these are preferably adjacent. Thus they contain an acyloxy group -C0-0- or an oxycarbonyl group -0-C0-.
  • .- Wise these are straight-chain and have 2 to 6 carbon atoms. Accordingly, they mean especially acetyloxy, propionyloxy, butyryloxy, pentanoyloxy, hexanoyloxy, acetyloxymethyl, propionyloxymethyl, butyryloxymethyl, pentanoyloxymethyl, 2-acety- loxyethyl, 2-propionyloxyethyl, 2-butyryloxyethyl, 3-acety-
  • R 1 is an alkenyl radical in which a CH 2 group has been replaced by CO or CO-O or 0-CO-, this can be straight-chain or branched. It is preferably straight-chain and has 4 to 13 carbon atoms. Accordingly, it means in particular acryloyloxymethyl, 2-acryloyloxyethyl, 3-acryloyloxypropyl, 4-acryloyloxybutyl, 5-acryloyloxypentyl, 6-acrylic-loyloxyhexyl, 7-acryloyloxyheptyl, 8-acryloyloxyoctyl, 5 9-acryloyloxynyloxyloxyloxylonyloxyloxynonyl, methoxyloxynonyl - thyl, 2-methacryloyloxyethyl, 3-methacryloyloxypropyl, 4-methacryloyloxybutyl, 5-methacryloyloxypentyl, 6-methacryloyl
  • Branched groups of this type usually do not contain 5 more than one chain branch.
  • R 1 represents an alkyl radical in which two or more CH 2 groups have been replaced by -0- and / or -C0-O-, this can be straight-chain or branched. It is preferably
  • 10 branches and has 3 to 12 carbon atoms. Accordingly, it means especially bis-carboxy-methyl, 2,2-bis-carboxy-ethyl, 3,3-bis-carboxy-propyl, 4,4-bis-carboxy-butyl, 5,5-bis-carboxy-pen- tyl, 6, 6-bis-carboxy-hexyl, 7,7-bis-carboxy-heptyl, 8,8-bis-carboxy-octyl, 9, 9-bis-carboxy-nonyl, 10,10-bis-carboxy-
  • Formula I includes both the racemates of these compounds and the optical antipodes and mixtures thereof. 0
  • Ri, F, Cl, CF 3 , 0CF 3 or OCF 2 preferably denotes H, in particular when X and Y mean H or alkyl.
  • V and L 2 are preferably identical and denote F, Cl or H, in particular H.
  • Particularly preferred compounds of the formula I which have a group of the formula 1 are those of the sub-formulas Ila to Iln:
  • Particularly preferred compounds of the formula I which have a group of the formula 2 are those of the sub-formulas I2a to I2o:
  • alkyl-Cyc-PheF-Cbu CHCl I2o
  • Particularly preferred compounds of the formula I which contain a group of the formula 7 are those of the sub-formulas I7a to l7o:
  • Particularly preferred compounds of the formula I which have a group of the formula 8 are those of the formulas I8a to I8o:
  • alkyl in each case mean alkyl or alkoxy groups with 1 to 12 carbon atoms.
  • the 1, cyclohexenylene group preferably has the following structures:
  • the compounds of the formula I are prepared by methods known per se, as described in the literature (for example in the standard works such as Houben-Weyl, Methods of Organic Chemistry, Georg-Thieme-Verlag, Stuttgart), under reaction conditions which are suitable for the reactions mentioned are known and suitable, and use can also be made of variants which are known per se and are not mentioned here in detail.
  • the compounds of formula I can, for example, in analogy to that of Dobier et al. (J. Am. Chem. Soc. 107 (12), 3626-31 (1985)) can be prepared by cycloaddition of alkenes onto styrene derivatives (cf. Scheme I):
  • the methylene cyclobutane carboxylic acid derivatives can be prepared from the corresponding nitriles with aqueous sodium hydroxide solution (e.g. Gripps et al. Am. Soc. __1 (1959), 2723-2728).
  • the compounds of the formula I can be obtained from the corresponding 3-substituted cyclobutanones by condensation with methane derivatives according to C. Burton et al., Tetrahedron Lett. 23. (24), 3003-6 (1988) and J. Fried, et al., Tetrahedron Lett. 25/4329 (1984) in the presence of phosphine niesw be produced (e.g. scheme 3)
  • the compounds of the formula I can be prepared by reducing a compound which otherwise corresponds to the formula I but which contains one or more reducible groups and / or C-C bonds instead of H atoms.
  • Suitable reducible groups are preferably carbonyl groups, in particular keto groups, furthermore, for example, free or esterified hydroxyl groups or aromatically bound halogen atoms.
  • the reduction can be carried out, for example, by catalytic hydrogenation at temperatures between about 0 ° and about 200 ° and pressures between about 1 and 200 bar in an inert solvent, for example an alcohol such as methanol, ethanol or isopropanol, an ether such as tetrahydrofuran (THF) or dioxane, an ester such as ethyl acetate, a carboxylic acid such as acetic acid or a hydrocarbon such as cyclohexane.
  • Suitable catalysts are suitably noble metals such as Pt or Pd, which are in the form of oxides (for example Pt0 2 , PdO) on a support
  • Ketones can also be prepared using the Clemmensen methods (with zinc, amalgamated zinc or tin and hydrochloric acid, expediently in an aqueous-alcoholic solution or in a heterogeneous phase with water / toluene at temperatures between about 80 and 120 °) or Wolff-Kishner (with hydrazine, expediently in the presence of alkali such as KOH or NaOH in a high-boiling solvent such as diethylene glycol or triethylene glycol at temperatures between about 100 and 200 °) to give the corresponding compounds of the formula I which contain alkyl groups and / or —CH 2 CH 2 bridges, be reduced.
  • Clemmensen methods with zinc, amalgamated zinc or tin and hydrochloric acid, expediently in an aqueous-alcoholic solution or in a heterogeneous phase with water / toluene at temperatures between about 80 and 120 °
  • Wolff-Kishner with hydrazine, expediently in the presence of
  • arylsulfonyloxy groups can be removed reductively with LiAlH 4 , in particular p-toluenesulfonyloxy methyl groups can be reduced to methyl groups, advantageously in an inert solvent such as diethyl ether or THF Temperatures between about 0 and 100 °. Double bonds can be hydrogenated with NaBH 4 or tributyltin hydride in methanol.
  • Esters of the formula I can also be esterified by corresponding carboxylic acids (or their reactive derivatives), in particular formula IV, with alcohols or phenols (or their reactive derivatives), in particular formula V,
  • DCC dicyclohexylcarbodiimide
  • Suitable reactive derivatives of the carboxylic acids mentioned are in particular the acid halides, especially the chlorides and bromides, and also the anhydrides, e.g. also “mixed anhydrides, azides or esters, in particular alkyl esters with 1-4 C atoms in the alkyl group.
  • Suitable reactive derivatives of the alcohols or phenols mentioned in particular the corresponding metal-alcoholic come - ⁇ n late or phenolates, preferably of an alkali metal such as sodium or potassium, into consideration.
  • the esterification is advantageously carried out in the presence of an inert solvent.
  • Particularly suitable are ethers such as diethyl ether, di-n-butyl ether, THF, dioxane or anisole, ketones such as. As acetone, butanone or cyclohexanone, amides such as. B. DMF or phosphoric acid hexamethyl triamide, hydrocarbons such as benzene, toluene or xylene, halogenated hydrocarbons such. B. carbon tetrachloride, dichloromethane or tetrachlorethylene and sulfoxides such. B. dimethyl sulfoxide or sulfolane.
  • Amides can be obtained, for example, from corresponding esters or acid halides by reaction with ammonia.
  • Suitable water-releasing agents are, for example, inorganic acid chlorides such as S0C1 2 , PC1 3 , PC1 5 , P0C1 3 , S0 2 C1 2 , C0C1 2 , and also P 2 0 5 , P 2 S 5 , A1C1 3 (for example as a double compound with NaCl ), aromatic sulfonic acids and sulfonic acid halides. You can do this in the presence or absence of an inert
  • Bases such as pyridine or triethylamine, aromatic hydrocarbons such as benzene, toluene or xylene or amides such as DMF into consideration.
  • nitriles of the formula I mentioned above corresponding acid halides, preferably the chlorides, can also be reacted with sulfamide, advantageously in an inert Solvents such as B. tetramethylene sulfone at temperatures between about 80 ° and 150 °, preferably at 120 °. After the usual work-up, the nitriles can be isolated directly.
  • sulfamide advantageously in an inert Solvents such as B. tetramethylene sulfone at temperatures between about 80 ° and 150 °, preferably at 120 °.
  • Ethers of the formula I can be obtained by etherification of corresponding hydroxyl compounds, in particular of the formula VI or VII, preferably corresponding phenols, the hydroxyl compound advantageously first being converted into a corresponding metal derivative, for example by treatment with NaH, NaNH 2 , NaOH, KOH, Na 2 CO 3 or K 2 C0 3 is converted into the corresponding alkali metal alcoholate or alkali metal phenolate. This can then be reacted with the corresponding alkyl halide, sulfonate or dialkyl sulfate, advantageously in an inert solvent such as. B. acetone, 1,2-dimethoxyethane, DMF or dimethyl sulfoxide or with an excess of aqueous or aqueous-alcoholic NaOH or KOH at temperatures between about 20 ° and 100 °.
  • nitriles of the formula I corresponding chlorine, bromine or iodine compounds of the formula I can also be reacted with a cyanide, preferably with a metal cyanide such as, for. B. NaCN, KCN or Cu 2 (CN) 2 , e.g. B. in
  • Compounds of the formula I in which A 1 is substituted by at least one F atom and / or a CN group can also be obtained from the corresponding diazonium salts by exchanging the Diazonium group against a fluorine atom or against a CN group, for example by the methods of Schiemann or Sandmeyer, can be obtained.
  • Dioxane derivatives or dithiane derivatives of the formula I are conveniently prepared by reacting an appropriate aldehyde (or one of its reactive derivatives) with a corresponding 1,3-diol (or one of its reactive derivatives) or a corresponding 1,3-dithiol, preferably in the presence an inert solvent such as Benzene or toluene and / or a catalyst e.g. a strong acid such as sulfuric acid, benzene or p-toluenesulfonic acid, at temperatures between about 20 ° and about 150 °, preferably between 80 ° and 120 °.
  • Acetals are primarily suitable as reactive derivatives of the starting materials.
  • aldehydes and 1,3-diols or 1,3-dithiols mentioned, and their reactive derivatives are known, and in some cases they can be prepared without difficulty from standard compounds of organic chemistry from compounds known from the literature.
  • the aldehydes can be obtained by oxidation of corresponding alcohols or by reduction of nitriles or corresponding carboxylic acids or their derivatives, the diols by reduction of corresponding diesters and the dithiols by reaction of corresponding dihalides with NaSH.
  • the liquid-crystalline media according to the invention preferably contain 2 to 40, in particular, as further constituents 4 to 30 components. These media very particularly preferably contain 7 to 25 components in addition to one or more compounds according to the invention.
  • These further constituents are preferably selected from nematic or nematogenic (monotropic or isotropic) substances, in particular substances from the classes of azoxybenzenes, benzylidene anilines, biphenyls, terphenyls, phenyl- or cyclohexylbenzoates, cyclohexane-carboxylic acid phenyl- or cyclohexyl esters, phenyl or cyclohexyl esters of cyclohexylbenzoic acid, phenyl or cyclohexyl esters of cyclohexylcyclohexane carboxylic acid, cyclohexylphenyl esters of benzoic acid,
  • trans-l 4-cyclohexylene or 1, -cyclohexenylene, pyr pyrimi-, c din-2,5-diyl or pyridine-2,5-diyl, dio l, 3-dioxane-2,5-diyl and G 2- (trans-l, 4-cyclohexyl) -ethyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl or 1,3-dioxane-2,5-diyl.
  • One of the radicals L and E is preferably Cyc, Phe or Pyr. ? 0 is preferably Cyc, Phe or Phe-Cyc.
  • the media according to the invention preferably contain one or more components selected from the compounds of the formulas 1, 2, 3, 4 and 5, in which L and E are selected from the group Cyc, Phe and Pyr and at the same time one or more components from 2e selected from the compounds of the formulas 1, 2, 3, 4 and 5, in which one of the radicals L and E is selected from the group Cyc, Phe and Pyr and the other radical is selected from the group -Phe-Phe-, -Phe-Cyc-, -Cyc-Cyc-, -G-Phe- and -G-Cyc-, and optionally one or more components are selected
  • R 'and R each independently represent alkyl, alkenyl, alkoxy, alkenyloxy or alkanoyloxy having up to 8 carbon atoms. In most of these compounds, R' and R" are each other different, one of these radicals is usually alkyl or alkenyl.
  • R in the compounds of the sub-formulas Ib, 2b, 3b, 4b and 5b, R "means -CN, -CF 3 , -OCF 3 , -OCHF 2 , F, Cl or -NCS; R has the same for the compounds of the sub-formulas 1a to 5a and is preferably alkyl or alkenyl, but other variants of the proposed substituents in the compounds of the formulas 1, 2, 3, 4 and 5 are also common. Many such substances or mixtures thereof are commercially available. All of these substances can be obtained by methods known from the literature or by analogy.
  • the media according to the invention preferably contain in addition
  • Components from the group of compounds Ia, 2a, 3a, 4a and 5a (Group 1) also components from the group of compounds Ib, 2b, 3b, 4b and 5b (Group 2), the proportions of which are preferably as follows :
  • Group 1 20 to 90%, in particular 30 to 90%
  • group 2 10 to 80%, in particular 10 to 50%, the sum of the proportions of the compounds according to the invention and of the compounds from groups 1 and 2 giving up to 100%.
  • the media according to the invention preferably contain 1 to 40%, particularly preferably 5 to 30%, of compounds according to the invention. Also preferred are media containing more than 40%, in particular 45 to 90%, of compounds according to the invention.
  • the media preferably contain three, four or five compounds according to the invention.
  • the media according to the invention are produced in a conventional manner.
  • the components are dissolved in one another, advantageously at elevated temperature.
  • the liquid-crystalline phases according to the invention can be modified so that they can be used in all types of liquid-crystal display elements which have hitherto become known.
  • pleochroic dyes for producing colored guest-host systems or substances for changing the dielectric anisotropy, the viscosity and / or the orientation of the nematic phases can be added.
  • K crystalline solid state
  • S smectic phase (the index indicates the phase type)
  • N nematic state
  • Ch cholesteric phase
  • I isotropic phase. The number between two symbols indicates the transition temperature in degrees Celsius.
  • a mixture of 1 mol of 4- (trans-pentylcyclohexyl) bromobenzene and 3 l of THF is mixed with 1 mol of BuLi at -70 ° C.
  • a mixture of 0.5 mol of zinc bromide in 1 l of THF is then added to the reaction mixture and the mixture is stirred at -65 ° C. for 30 minutes.
  • 1 mol of vinyl bromide and 0.022 mol of nickel (II) chloride / TPP are added.
  • the reaction mixture is stirred for 16 hours at room temperature and worked up as usual.
  • the styrene derivative obtained is processed unpurified.
  • Glacial acetic acid is stirred at room temperature for 17 hours. After the usual work-up, the product is obtained, which is further processed without being cleaned.
  • the mixtures thus obtained are filled into a test cell.
  • the "voltage holding ratio" of these cells is measured at room temperature HR (RT) and after heating to 100 ° C. HR (100).
  • the "holding ratio” was measured according to: G. Weber et al. Liquid Crystals 5_, 1320 (1989).
  • the compounds (1), (2) and (3) are therefore suitable for the production of mixtures with positive anisotropy of the dielectric constants and high values of the holding ratio, in particular for active matrix displays.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

Des dérivés de cyclobutane de méthylène ont la formule (I), dans laquelle R1, A1, A2, Z1, Z2, L1, L2, X, Y et m ont la signification donnée dans la première revendication. L'invention concerne également leur utilisation comme composants de milieux de cristaux liquides pour affichages électro-optiques.
EP92905642A 1991-03-16 1992-03-04 Derives de cyclobutane de methylene Withdrawn EP0576450A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4108713 1991-03-16
DE4108713 1991-03-16

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EP0576450A1 true EP0576450A1 (fr) 1994-01-05

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US (1) US5384072A (fr)
EP (1) EP0576450A1 (fr)
JP (1) JPH06507603A (fr)
DE (1) DE4206771A1 (fr)
WO (1) WO1992016483A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218613B4 (de) * 1992-06-05 2005-09-29 Merck Patent Gmbh Flüssigkristallines Medium
DE4239169A1 (de) * 1992-11-21 1994-05-26 Merck Patent Gmbh Cyclobutan - Benzol - Derivate
DE19945889A1 (de) * 1998-09-29 2000-04-27 Merck Patent Gmbh Flüssigkristalline Verbindungen und Flüssigkristallines Medium
DE19955932B4 (de) 1998-11-26 2020-08-06 Merck Patent Gmbh Cyclobutan-Derivate und flüssigkristallines Medium
DE10141565A1 (de) * 2000-09-22 2002-04-11 Merck Patent Gmbh Flüssigkristallverbindung, diese enthaltendes Flüssigkristallmedium und elektrooptische Flüssigkristallanzeige
EP1926798B1 (fr) * 2005-09-19 2009-09-30 Merck Patent GmbH Composés de cyclobutane et de spiro[3.3]heptane

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Publication number Priority date Publication date Assignee Title
DE3717484A1 (de) * 1987-05-23 1988-12-01 Merck Patent Gmbh Cyclobutanderivate
JPH01216967A (ja) * 1988-02-26 1989-08-30 Chisso Corp 液晶化合物

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9216483A1 *

Also Published As

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WO1992016483A1 (fr) 1992-10-01
US5384072A (en) 1995-01-24
DE4206771A1 (de) 1992-09-17
JPH06507603A (ja) 1994-09-01

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