SYNTHESIS OF TWO ISOMERS OF HEXAMETHYLAURINS

Abstract

A few methods of preparing aurin type pigments have been reported since many years before. But only three kinds of pigments were synthesized until recent times. Nowadays the authors established a simple method of preparation and it was applied to synthesize more than ten pigments successfully. Some of them were published and the others given at the meeting. In this paper the authors principally considered the differences of uv and v spectra between the two isomers of hexamethylaurins.