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The Synthesis and Liquid‐Crystal Transition Temperatures of Some Fluoro‐Substituted Benzonitriles
Author(s) -
Kelly Stephen M.,
Schad Hanspeter
Publication year - 1985
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19850680535
Subject(s) - chemistry , cyclohexane , benzonitrile , benzene , liquid crystal , ring (chemistry) , alkyl , crystallography , medicinal chemistry , stereochemistry , organic chemistry , physics , optics
Various laterally fluoro‐substituted benzonitriles have been prepared containing a trans ‐4‐( n ‐alkyl)cyclohexane ring linked to the 4‐position of the benzonitriles either through a methyleneoxy (CH 2 O–) or an ethylene (CH 2 CH 2 ‐) bridge. The bridging group links the benzonitrile and cyclohexane rings either directly or through an additional 1,4‐bonded cyclohexane or benzene ring. The synthesis and liquid‐crystal transition temperatures of these new compounds are described. In several cases the nematic‐isotropic transition temperatures of F‐substituted benzonitriles are found to be higher than those of the non‐laterally substituted analogues.