Pyridinium dicyanomethylide (1) undergoes 1,3-dipolar cycloaddition to diphenylcyclopropenone producing the 2H-quinolizin-2-one (4), while, with diphenylcyclopropenethione, (1) reacts as a nucleophile to afford the indenopyridine-2-thione derivative (7).
K. Matsumoto, Y. Kono and T. Uchida, J. Chem. Soc., Chem. Commun., 1976, 1045 DOI: 10.1039/C39760001045
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