Some novel quinone‐type dyes containing naphthoquinone and related fused ring systems

Abstract

A variety of 1,4‐thiazines, thiazoles, 1,4‐dithines and 2,2′‐bithiazoles containing fused naphthoquinone and related rings have been prepared. The compounds include several novel chromophoric heterocyclic system and their visible absorption spectra are discussed. Copyright © 1988 Journal of Heterocyclic Chemistry