Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Abstract

The syntheses of new liquid crystalline 3‐aryl‐5‐alkylisoxazoles, 3‐aryl‐5‐alkyl‐1H‐pyrazoles and 3‐aryl‐5‐alkyl‐2‐isoxazolines with ether or ester bridges are reported. The key stage in the synthesis is the oxidation of the 2‐isoxazoline ring to isoxazole. The influences of core‐heterocycle type and bridging group on the mesomorphic properties for the prepared compounds are discussed.