Reactions of pyridinium bis(alkoxycarbonyl)methylides with diphenylcyclopropenone in refluxing acetonitrile produce the corresponding 1 : 1 complexes (3), e.s.r. analysis of which indicates the presence of radical cations of the ylides (1).
K. Matsumoto, H. Fujita and Y. Deguchi, J. Chem. Soc., Chem. Commun., 1978, 817 DOI: 10.1039/C39780000817
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