Abstract The product 2 in the 1, 3-dipolar cycloaddition of one equivalent of diazomethane to p-toluquinone (1) was determined by 250 MHz nmr spectra to be approximately 85% 6- methyl-1-H-indazole-4, 7-dione (2b). X-ray crystallographic analysis was employed in the characterization of 1, 6-dimethyl-1-H-indazole-4, 7-dione (4a), which was the major 1-N- methyl regioisomer in the methylation of the cycloaddition mixture 2 with diazomethane. ...
