Though the yellow condensation product obtained from I11 gave wellformed crystals, it did not melt sharply and after repeated fractionation it was separated into two isomeric quinones melting at 185 and 167'. Since all of the known methyl-1, 2-benzanthraquinones melt in this same range, the melting temperature in itself is hardly characteristic and it was necessary to secure samples for comparison. The simplest course for the reaction to take would involve ...
