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Communication | Special issue | Vol 5, No. 1, 1976, pp.401-407
Published online, 1st January, 1970
DOI: 10.3987/S-1976-01-0401
Novel Pyridazinium Ion Synthesis. Reaction of Diaminocyclopropenium Ion with Diazoalkanes

Zen-ichi Yoshida,* Hisatoshi Konishi, Keizo Hayashi, and Hisanobu Ogoshi

*Department of Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyou-ku, Kyoto 606-8501, Japan


The reaction of bis(diisopropylamino)cyclopropenium perchlorate (1) with an excess of RCHN2 (R: H, CH3) afforded 3,4-bis(diisopropylamino)-6-R-pyridazinium perchlorate (2a, b). This reaction provides a novel synthetic method of pyridazinium compounds.