Du Wei-song
2004
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Journal
Fine chemicals
Abstract
The synthetic method of liquid crystals with terminal difluoromethoxy group and backbone of phenylbicyclohexane is reported in detail.trans-Alkylbicyclohexylphenols are obtained by coupling of 4-alkylcyclohexylcyclohexanone with the Grignard reagent of 4-bromoanisole or 4-bromo-2-fluoroanisole,followed by dehydration,hydrogenation,isomerization and demethylation.Etherification of the phenols gives the target compounds with overall yields of 25.6%~30.6%.The results of DSC analysis show that these compounds have low melting points and high clearing points,and that the lateral fluorine substituent suppresses the smectic phase and broadens the nematic phase range.