引用本文:
王小伟, 刘骞峰, 高仁孝, 冯凯, 郭强. 反式-环己基含氟二苯乙炔类液晶的合成与性能[J]. 应用化学,
2004, 21(3): 281-285.
Citation: WANG Xiao-Wei, LIU Qian-Feng, GAO Ren-Xiao, FENG Kai, GUO Qiang. Synthesis and Property of Liquid Crystal Compounds: trans-Cyclohexyltolan-type with Lateral Fluorines[J]. Chinese Journal of Applied Chemistry, 2004, 21(3): 281-285.
Citation: WANG Xiao-Wei, LIU Qian-Feng, GAO Ren-Xiao, FENG Kai, GUO Qiang. Synthesis and Property of Liquid Crystal Compounds: trans-Cyclohexyltolan-type with Lateral Fluorines[J]. Chinese Journal of Applied Chemistry, 2004, 21(3): 281-285.
反式-环己基含氟二苯乙炔类液晶的合成与性能
English
Synthesis and Property of Liquid Crystal Compounds: trans-Cyclohexyltolan-type with Lateral Fluorines
Abstract:
Six liquid crystal compounds of trans-cyclohexyltolan-type with lateral fluorines R1PF2TR2(6) were synthesized via cis-trans isomerization of cyclohexane intermediates(3,3') in dichloroethane-AlCl3 medium with the yield of 35%, much higher than expected(13%). The catalytic mechanisms of the cis-trans cyclohexyl isomerization and the cross-coupling reaction promoted by Pd(Ⅱ) are discussed. All of the compounds were identified by IR, 1H NMR and MS. The results showed that the end compounds 6 exhibit higher optical anisotropy(Δn) and thermal stability in the liquid crystal composition of PCH, and indicated that the lateral fluorine atoms in the molecular structure restrain the Δn value, giving promising applications of these compounds in liquid crystal display.
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Key words:
- alkylcyclohanone
- / tolan
- / cis-trans isomerization
- / optical anisotropy
- / liquid crystal
- / synthesis
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