Quinonoid Dyes: XIV*—Relation between Coplanarity and Substantivity of Quinonoid Dyes applied to Secondary Cellulose Acetate and Cellulosic Fibres

Abstract

Two series of coplanar dyes derived from naphthaquinones have been synthesised, and for each dye a corresponding non‐coplanar compound has also been obtained. Dyes belonging to one of these series (I–X) could be applied to secondary cellulose acetate rayon from aqueous dispersion, whilst cellulosic fibres could be dyed satisfactorily from an alkaline reducing bath with dyes belonging to the second series (XI–XX). The affinity values of these dyes have been determined, and the importance of coplanarity for substantivity is discussed.