The thermal properties for a homologous series of 4-alkylcyclohexyl 4-alkoxy- and 4-cyanocinnamates are examined. They exhibit nematic phases with low melting points. The effect of the cyclohexyl group on the mesophase stability is discussed.
Ferroelectric Liquid Crystals. Part 2. Chiral phenyl benzoates incorporating atrans-1,4-disubstituted cyclohexane ring
作者:Stephen M. Kelly、Richard Buchecker
DOI:10.1002/hlca.19880710218
日期:1988.3.16
About forty novel phenylbenzoates also incorporating a trans-1,4-disubstituted cyclohexanering and a chiral centre have been prepared. The dependence of the liquid-crystal transition temperatures of this new class of compounds on lateral substituents, diverse central linkages, chain lengths, and position of the chiral centre has been studied systematically. The synthesis and liquid-crystal transition
New couple: A cross‐coupling reaction at the carbon vertex of a monocarba‐closo‐dodecaborate has been developed to allow efficient introduction of various aryl groups and other sp2/sp‐hybridized carbon centers. A copper(I) complex facilitated the coupling process with a wide range of electrophiles at roomtemperature. The reaction was used to prepare a series of C‐arylated carborane anion derivatives
About twenty substitutedphenylbenzoatesincorporating a trans-4-pentylcyclohexyl moiety have been synthesised. The synthesis, liquid-crystal transition temperatures, and enthalpies of fusion are reported. The effect of variations in chainlength and central linkage on the liquid-crystal transition temperatures is discussed.
申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US05279764A1
公开(公告)日:1994-01-18
The invention relates to dihalogenobenzene derivatives of the formula I R.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --(Z.sup.2 --A.sup.3).sub.n --R.sup.2 wherein R.sup.1, R.sup.2, A.sup.1, A.sup.2, A.sup.3, Z.sup.1, Z.sup.2 and n are as defined in the specification.