Abstract
4, 4'- and 3, 3'-Dibenzoanthronyls were chloromethylated by use of concentrated sulfuric acid and sym-dichlorodimethyl ether to obtain each of their bis-chloro methylated compound, respectively. These dibenzoanthronyls and their chloro methylated compounds were oxidatively decomposed with chromic acid and several kinds of decomposition product were obtained depending on the extent of oxidation. By studying the structure of these compounds, it was confirmed that the chloromethyl group enters into 9, 9'-position. Syntheses of pyridinium salt and isothiuronium salt were made to give watersoluble dyes and their cyclization gave benzoanthrone type vat dyes. Their properties, especially of their dyeing qualities, have been clarified.
