Synthesis and Mesomorphic Properties ofm-Cyano-orm-Halogeno-Benzoate Derivatives

Abstract

Thirty four benzoate derivatives were prepared. They belong to the two following series: the 4-n-alkylphenyl 3-cyano-or 3-fluoro-4-n-alkoxybenzoates and the 4-n-alkylphenyl 4-(3-cyano-or 3-bromo-4-n-alkoxy-or 4-n-alkylbenzoyloxy-)benzoates. In the latter series all the compounds are measomorphic; in the former one, only 3-cyano compounds with long alkoxy chain, exhibit a small mesomorphic range. All the cya[ngrave]o compouns exhibit very high negative dielectric anisotropies.