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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. shu

Synthesis and Property of Liquid Crystal Compounds: trans-Cyclohexyltolan-type with Lateral Fluorines

1.
Xi'an Ruilian Modern Electronic Chemicals Co. Ltd, Xi'an 710065

Corresponding author: GAO Ren-Xiao,
Received Date: 22 May 2003
Available Online: 9 December 2003
Fund Project: 科技型中小企业创新基金(03C26216110299)项目资助 (03C26216110299)

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(Δ_n) and thermal stability in the liquid crystal composition of PCH, and indicated that the lateral fluorine atoms in the molecular structure restrain the Δ_n value, giving promising applications of these compounds in liquid crystal display.
- alkylcyclohanone,
- tolan,
- cis-trans isomerization,
- optical anisotropy,
- liquid crystal,
- synthesis
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