The relationship between molecular structure and mesomorphic properties of 2,2′- and 3,2′-difluoroterphenyls synthesized by palladium-catalysed cross-couplings
作者:
Michael Hird,
KennethJ. Toyne,
GeorgeW. Gray,
DamienG. McDonnell,
IanC. Sage,
期刊:
Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 18,
issue 1
页码: 1-11
ISSN:0267-8292
年代: 1995
DOI:10.1080/02678299508036584
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Several homologues of two structurally different types of mesogenic difluoroterphenyls have been prepared. One set of compounds contains two inner-core fluoro-substituents and the other set possesses both an inner-core and an outer-core fluoro-substituent. The use of various types of palladium-catalysed cross-coupling reactions was invaluable in the synthesis (for example, selective couplings, and couplings to trifluoromethanesulphonate derivatives). Additionally, a novel selective lithiation is reported. The mesogenic materials are all low melting and the types of mesophase generated are considerably structure dependent. However, most of the materials support the tilted Scphase which is required of ferroelectric host materials. The mesomorphic behaviour of these novel materials is discussed in terms of the molecular structure and the structure/property relationships are compared with those for difluoroterphenyls with different arrangements of lateral fluoro-substitution.
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