Methylation of anhydrosepedonin and deoxysepedonin with diazomethane afforded three different kinds of dimethyl ethers. The structures of these ethers were examined by their reaction with liquid ammonia, and long-range coupling between methoxyl protons and the adjacent ring proton by nmr spectra from which the structures of 3, 4-dimethoxy, 2, 6-dimethoxy, and 2, 4-dimethoxy derivatives were clarified. The mass spectra of these dimethyl ethers showed the difference in the position of these methoxyls
