The synthesis of 3-isopropyl-4, 5-dimethylindan is described. The usual diazoacetic ester treatment of this indan, followed by decarboxylation and dehydrogenation, resulted in the formation of 2-isopropyl-4, 5-dimethylazulene by migration of an isopropyl group and the isolation, in an impure state, of what is believed to be 3-isopropyl-4, 5-dimethylazulene.
