Helvetica Chimica Acta p. 1580 - 1587 (1984)
Update date:2022-08-17
Topics:
Kelly, Stephen M.
Schad, Hanspeter
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 substituted esters differing only in the presence of a benzene ring and the above-mentioned rings is established.
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