苯基环己烷类液晶的合成和性能——Ⅰ.4-正烷基-1-(4-取代苯基)环己烷类  

Syntheses and Properties of Phenyl-Cyclohexane Liquid Crystals Ⅰ. 4-Alkyl-1-(4-substituted phenyl) cyclohexanes

作　　者：杨新浩 华曦[1] 李国镇[1] 

机构地区：[1]华东化工学院应用化学研究所

出　　处：《华东化工学院学报》1991年第6期722-729,共8页

基　　金：国家自然科学基金

摘　　要：以环己烯和酰氯反应首先制得4-正烷基-1-苯基环己烷(C_3,C_5,C_7),再用溴化法和碘化法合成4-正烷基-1-(4-溴代苯基)环己烷(C_3,C_5)和4-正烷基-1-(4-碘代苯基)环己烷(C_3,C_5,C_7)。以碘化物为中间体合成4-正烷基-1-(4-氰基苯基)环己烷(C_3,C_5,C_7)。经元素分析、红外、质谱、核磁共振鉴定,上述化合物结构正确,相变温度与文献相符,产率也高。用气相色谱对顺反异构体作了分析,并对反应机理作了初步探讨。Pure 4-alkyl-1-phenylcyclohexanes (C_3, C_5, C_7) were prepared with acylation of cyclohexene, and their cis-trans-isomers were separated by chromatography. With new methods, two liquid crystals of 4-alkyl-1-(4-bromophenyl) cyclohexanes (C_3, C_5) and three new compounds of 4-alkyl-1-(4-iodophenyl) cyclohexanes (C_3, C_5, C_7) were synthesized with broruination and iodination. Three liquid crystals of 4-alkyl-1-(4-cyanophenyl) cyclohexanes (C_3, C_5, C_7) from iodizated compounds were also prepared. The structures of all the compounds prepared are proved to be correct by determination of element analysis, IR, MS and NMR. Transition temperatures of liquid crystal compounds prepared agree with what had already been reported before, and their yields are high. Reaction mechanism is also discussed.

关 键 词：液晶 苯基环己烷 

分 类 号：O624.11[理学—有机化学]