Method for synthesizing fluorine-containing antiform alkyl cyclohexyl biphenyl single liquid crystal

A technology based on biphenyls and liquid crystal monomers, applied in the direction of liquid crystal materials, chemical instruments and methods, preparation of halogenated hydrocarbons, etc., can solve the problems of excessive discharge of three wastes, rising costs, and inability to produce liquid crystals

Active Publication Date: 2009-10-21
山东盛华新材料科技股份有限公司
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Problems solved by technology

However, in the process of product dehydration and transformation, the reaction time is long and the reaction nodes are not easy to control, the post-treatment is troublesome and the three wastes are discharged more; in the synthesis, due to the large number of active sites of the reactant molecules, it is very easy to produce isomers, these Isomers cannot produce liquid crystal phases. Their appearance not only affects the product yield and increases the cost, but also is a harmful substance in the target compound, which greatly affects the p

Method used

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  • Method for synthesizing fluorine-containing antiform alkyl cyclohexyl biphenyl single liquid crystal
  • Method for synthesizing fluorine-containing antiform alkyl cyclohexyl biphenyl single liquid crystal
  • Method for synthesizing fluorine-containing antiform alkyl cyclohexyl biphenyl single liquid crystal

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Embodiment

[0049] Example, a method for synthesizing fluorine-containing trans-alkylcyclohexylbiphenyl liquid crystal monomers is to select bromobenzene and magnesium for Grignard reaction, then couple with alkylcyclohexanone and hydrolyze, then dehydrate, Synthesis of alkyl cyclohexyl iodobenzene by hydrogenation, transformation and iodination, Grignard reaction between p-fluorobromobenzene and magnesium, then low-temperature coupling to synthesize p-fluorophenylboronic acid, and finally the target compound was synthesized by coupling reaction, which is the synthesis of The route is as follows:

[0050]

[0051]

[0052] Where I is 4-alkyl-1-phenylcyclohexanol, II is 4-alkyl-1-phenylcyclohexene, III is alkylcyclohexylbenzene, IV is trans-alkylcyclohexylbenzene, V is trans-alkylcyclohexyl iodobenzene, VI is p-fluorophenylboronic acid, VII is 4-(4-alkylcyclohexyl)-4',-fluoro-1-1',-biphenyl, R is represented by alkane Base, representing ethyl, propyl, butyl, pentyl respectively; Thi...

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Abstract

The invention discloses a method for synthesizing fluorine-containing antiform alkyl cyclohexyl biphenyl single liquid crystal; in the method, bromobenzene and magnesium are selected to carry out Grignard reaction; then the reactants are coupled and hydrolyzed with alkyl cyclohexanone; dehydration, hydrogenation, transformation and iodization are carried out to synthesize alkyl cyclohexyl iodide; the Grignard reaction is carried out on fluorobromobenzene and magnesium, then low temperature coupling is carried out to synthesize p-fluoropheyl boric acid; finally, coupling reaction is carried out to synthesize the target compound; the method of the invention has the characteristics of use of highly active load catalyst, high yield, low production cost, little discharge of three wastes, reduction of generation of isomers and improvement of selectivity and yield of the target compound.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for synthesizing a fluorine-containing trans-alkylcyclohexyl biphenyl liquid crystal monomer. Background technique [0002] With the rapid development of Super Twisted Nematic Liquid Crystal (STN-LCD) and Thin Film Transistor Array Driven Liquid Crystal Display (TFT-LCD) technology, in recent years the two have largely occupied the high-end display market such as desktop monitors and portable notebook computers, among which TFT -LCD uses a thin film transistor array to directly drive liquid crystal molecules, which eliminates the effect of cross distortion, so the display information capacity is large. At this time, it is necessary to use a low-viscosity liquid crystal material to greatly improve the response speed, thereby meeting the needs of video image display. Fluorine-containing trans-cyclohexylbiphenyl 4-(4-alkylcyclohexyl)-4'-fluoro-1,1'-biphe...

Claims

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Application Information

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IPC IPC(8): C09K19/12C07C25/18C07C17/263
Inventor 杜开昌韩春林王金荣吕勇达王作鹏
Owner 山东盛华新材料科技股份有限公司
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