申请人:VEB Werk fuer Fernsehelektronik
公开号:US04626375A1
公开(公告)日:1986-12-02
New liquid-crystalline esters of the 4-[(4-alkyl-cyclohexyl)-methyl]-benzoic acids or cyclohexanecarboxylic acids which are suitable for electro-optical displays have the general formula ##STR1## wherein R.sup.1 =C.sub.n H.sub.2n+1 R.sup.2 =H, ##STR2## wherein n=an integer from 1 to 10, m=an integer from 1 to 10, S=an integer from 1 to 10. The aforementioned esters are produced by converting the corresponding 4-alkylcyclohexanecarboxylic acid chloride according to Friedel-Crafts with benzene, reduction of the corresponding ketones to 4-alkyl-cyclohexyl-methyl-benzene, Friedel-Crafts acylation with acetyl chloride and oxidation with bromine to the 4-[(4-alkyl-cyclohexyl)-methyl]-benzoic acids, which are esterified according to conventional methods with substituted cyclohexanols or phenols or are hydrogenated with hydrogen and Raney-Nickel under high-pressure to 4-[(4-alkyl-cyclohexyl)-methyl]-cyclohexanecarboxylic acids, and then are esterified according to conventional procedures with substituted cyclohexanols or phenols.
4-[(4-烷基-环己基)-甲基]-苯甲酸或环己基甲酸的新液晶酯适用于电光显示,其具有以下一般式:##STR1## 其中R.sup.1=C.sub.n H.sub.2n+1,R.sup.2=H,##STR2## 其中n为1至10的整数,m为1至10的整数,S为1至10的整数。上述酯类是通过将相应的4-烷基环己基甲酸氯化物按照Friedel-Crafts法与苯反应,将相应的酮还原为4-烷基环己基甲基苯,然后进行Friedel-Crafts酰化反应,使用乙酰氯和溴氧化成4-[(4-烷基-环己基)-甲基]-苯甲酸,然后按照常规方法用取代环己醇或酚酯化或在高压下使用氢和Raney-Nickel还原成4-[(4-烷基-环己基)-甲基]-环己基甲酸,然后按照常规程序用取代环己醇或酚酯化。