The Synthesis of Several Lateral Difluoro-substituted 4,4 ''-Dialkyl- and 4,4 ''-Alkoxyalkyl-Terphenyls and a Rationalisation of the Effect of Such Substitution on Mesophase Type and Transition Temperatures?

被引：91
作者：
Gray, G. W. [1 ]
Hird, M. [1 ]
Toyne, K. J. [1 ]
机构：
[1] Univ Hull, Sch Chem, Kingston Upon Hull HU6 7RX, N Humberside, England
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1991年 / 204卷
关键词：
fluoro-substitution; terphenyls; structure-property relationships;
D O I：
10.1080/00268949108046593
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In recent years we have prepared a large number of mono-fluoro-and ortho-difluoro-substituted 4,4 ''-dialkyl- and 4,4 ''-alkoxyalkyl-terphenyls. The synthesis and transition temperatures of a variety of related difluoro compounds is presented here so that it is now possible to identify (i) broadening of the molecule, (ii) twisting about an inter-annular bond, and (iii) the presence of an 'inner' (2-, 2'-, 3'- or 2 ''-substituent) or an 'outer' (3- or 3 ''-substituent) fluorine, as being the major factors which influence the type and the thermal stability of the mesophases obtained.
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页码：43 / 64
页数：22
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