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Alkyl cyclohexyl alkynes liquid crystal compound and its preparation method

A technology of liquid crystal compounds and alkyl rings, applied in chemical instruments and methods, liquid crystal materials, etc., can solve the problems of unsatisfactory fat solubility, unfavorable high-speed response of liquid crystal display, high viscosity of the system, etc., and achieve reduced rigidity and high resistivity , good fat-soluble effect

Active Publication Date: 2007-03-28
JIANGSU AOLUNDA HIGH TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the liquid crystal material has improved the fat solubility of diphenylacetylene liquid crystals to a large extent and reduced the viscosity of the system, its fat solubility is still not ideal, which will still lead to crystallization of the mixed system, and the viscosity of the system is still too high , which is not conducive to the realization of high-speed response operation of the liquid crystal display

Method used

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  • Alkyl cyclohexyl alkynes liquid crystal compound and its preparation method
  • Alkyl cyclohexyl alkynes liquid crystal compound and its preparation method
  • Alkyl cyclohexyl alkynes liquid crystal compound and its preparation method

Examples

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Embodiment 1

[0017] Embodiment 1: Preparation of liquid crystal monomer 1-[(trans)-4-ethylcyclohexylethynyl]-2-fluoro-4-[(trans)-4'-n-propylcyclohexylethynyl]benzene.

[0018] 1. From (anti)-4-ethylcyclohexylethynyl and 2-fluoro-4-bromoiodobenzene, 1-[(anti)-4-ethylcyclohexylethynyl]-2- Fluoro-4-bromobenzene.

[0019] In a 500ml four-necked flask, add 200ml triethylamine, 13.6g (0.1mol) (trans)-4-ethylcyclohexylacetylene, 46.5g (0.15mol) 1-bromo-2-fluoroiodobenzene, 0.4g tetra( Triphenylphosphine) palladium dihalide, 0.4g cuprous iodide, 0.8g triphenylphosphine, stirred and refluxed for 12 hours, cooled to room temperature, added 80ml saturated ammonium chloride solution and 80ml dichloroethane, stirred for several minutes, Separate the organic phase, extract the aqueous phase with 3 x 60ml of dichloromethane, combine the organic phases, wash with 3 x 200ml of water until neutral, dry over anhydrous sodium sulfate, spin off the solvent, and use petroleum ether (60-90) for the residue Rec...

Embodiment 2

[0067] Example 2: Preparation of liquid crystal monomer 1,4-bis[(trans)-4-ethylcyclohexylethynyl]-2-fluorobenzene

[0068] From (anti)-4-ethylcyclohexylacetylene and 2,5-bromofluorobenzene, 1,4-bis[(anti)-4-ethylcyclohexylethynyl]-2-fluorobenzene was prepared by Heck reaction liquid crystal monomer.

[0069] In a 500ml four-necked flask, add 200ml triethylamine, 29.8g (0.1mol) (trans)-4-ethylcyclohexylacetylene, 14.0g, 0.45g 2-fluoro-1,4-dibromobenzene, 0.4g tetrakis( Triphenylphosphine) palladium dihalide, 0.4g cuprous iodide, 0.8g triphenylphosphine, stirred and refluxed for 12 hours, cooled to room temperature, added 80ml saturated ammonium chloride solution and 80ml dichloroethane, stirred for several minutes, Separate the organic phase, extract the aqueous phase with 3 x 60ml of dichloromethane, combine the organic phases, wash with 3 x 200ml of water until neutral, dry over anhydrous sodium sulfate, spin off the solvent, and use petroleum ether (60-90) for the residue ...

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Abstract

The invention relates to preparation method for liquid crystal particular to modification for alkyl cyclohexyl alkyne. Wherein, substituting one or more hydrogen atom on benzene ring of said liquid crystal by fluoro atom; the lateral effect of fluoro atom decreases conjugated effect and molecular rigidity, makes the liquid crystal have lower viscosity and stronger fatsoluble and benefit to high-speed response LCD.

Description

technical field [0001] The invention relates to a liquid crystal material and a preparation method, in particular to the improvement of an alkylcyclohexylalkyne liquid crystal monomer. Background technique [0002] With the development of liquid crystal display technology and optical communication technology, people have put forward higher requirements for the performance of liquid crystal materials. For this reason, people have developed various single crystal materials with different properties, and then mixed them in a certain proportion to obtain mixed liquid crystal materials. To meet the requirements of different displays. Among them, optical anisotropy (Δn) is an important index of mixed liquid crystals, which needs to be carefully regulated in liquid crystal displays. In recent years, with the improvement of liquid crystal display requirements, large Δn liquid crystal materials have attracted attention. Monomer liquid crystals with large Δn include biphenyl liquid c...

Claims

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Application Information

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IPC IPC(8): C09K19/18
Inventor 钮傲盘尹益刘新钮强
Owner JIANGSU AOLUNDA HIGH TECH IND
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