The synthesis and transition temperatures of some ferroelectric host materials based on 4- and 4′-(trans-4-alkylcyclohexylmethoxy)-2,3-difluorobiphenyls
作者:
Michael Hird,
KennethJ. Toyne,
GeorgeW. Gray,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 4
页码: 625-641
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408036535
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A range of 2,3-difluoro-substituted biphenyls incorporating a cyclohexylmethoxy unit as one terminal chain has been prepared and these materials are compared to the analogous compounds already reported with a dimethylene linking group. Related, directly-linked cyclohexylbiphenyls and some open-chain analogues have also been prepared which add to the diversity of the compounds reported. These were prepared as host materials of low birefringence for ferroelectric (S*c) mixtures and in general, the compounds have quite high Scphase stability. Metallation procedures have been used to prepare arylboronic acids which were employed in palladium-catalysed cross-coupling reactions to provide good yields of liquid crystal materials. The synthesis and transition temperatures of these compounds are discussed and compared with each other and with other selectedortho-difluoro-substituted systems.
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