New Troponoid Liquid Crystalline Compounds, 5-Alkoxy-2-(4- alkoxybenzoylamino)tropones.

The X-ray crystallographic structural analysis of 5-butoxy-2-(4-methoxybenzoylamino)tropone, a liquid crystalline compound, revealed to form the head-to-tail dimer, in which a CH-π interaction between the benzoyl π-system and the β-hydrogen of the 5-butoxy group on the tropone ring of the neighboring molecule as well as intermolecular π-π stacking interactions with the two tropone systems. On the other hand, 2-(4-alkoxybenzoylamino)-5-methoxytropone lacking the β-hydrogen and the corresponding benzenoid, N-(4-alkoxyphenyl)-4-alkoxybenzamide were non-mesogenic.