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The synthesis and transition temperatures of ester derivatives of 2‐fluoro‐4‐hydroxy‐ and 3‐fluoro‐4‐hydroxybenzonitriles also incorporating aliphatic ring systems
Author(s) -
Kelly Stephen M.,
Schad Hanspeter
Publication year - 1984
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.19840670624
Subject(s) - chemistry , ring (chemistry) , cyclohexane , benzene , octane , liquid crystal , medicinal chemistry , bicyclic molecule , stereochemistry , organic chemistry , physics , optics
The synthesis and liquid‐crystal transition temperatures of forty ester derivatives of 2‐fluoro‐4‐hydroxybenzonitrile and 3‐fluoro‐4‐hydroxybenzonitrile are reported. The esters contain the trans ‐1,4‐disubstituted cyclohexane or the 1,4‐disubstituted bicyclo[2.2.2]octane rings (some contain an additional phenyl ring). Many of the novel F‐substituted esters exhibit substantially higher nematic‐isotropic transition temperatures than the corresponding unsubstituted esters. The order of clearing points of these laterally substiuted esters differing only in the presence of a benzene ring and the above‐mentioned rings id established.