Reactions of Basic Dyes with Cyclic Derivatives of an Acid Character

Abstract

The recent discovery that the actual staining agent in the Ziehl-Neelson technic is an addition product of the phenol and the dye employed led the authors to investigate the character of the reaction products of various basic dyes with a considerable variety of cyclic derivatives of a phenolic or acid character. Analytical data are presented which indicate that basic dyes form addition products, in general, with typical phenols. With more definitely acid cyclic derivatives the reaction is primarily metathetical, resulting in the formation of organic salts of the dyes. In some instances both metathesis and addition result. Readers are referred to the following paper for information as to the practical staining value of certain of these compounds.