Anthraquinone dyes. Part V. A contribution to the study of the Marschalk reaction. Nuclear methylation of 1-aminoanthraquinone leuco-derivative
Abstract
1-Amino-2-methylanthraquinone is obtained by the action of formaldehyde on the 1-aminoanthraquinone vat followed by oxidation of the reaction mixture with air. The dependence of the amount of a transient 2,2′-methylenebis-(1-aminoanthraquinone) produced upon the conditions is studied. A reaction mechanism is suggested.