1B04 Synthesis and Mesomorphic Property of 4-Benzoylamino-3-formylbenzonitriles

Abstract

We prepared 4-benzoylamino-3-formylbenzonitriles in order to investigate effect of the lateral substituent on mesomorpic properties. 4- (4-Alkoxybenzoylamino) -3-formylbenzo-nitriles showed an enantiotropic smectic A phase with higher clearing points than those of the corresponding benzonitriles without any substituents at C-3. 4-Benzoylamino-3-formyl- benzonitriles can make an intramolecular hydrogen bond between the carbonyl group of the formyl group at C-3 and the amino group at C-4. This hydrogen bond makes molecules flat and rigid to enhance mesomorpic properties.