The nitrile ylide (1) adds to the cyclic double bond of functional methylenecyclopropenes to give a pyridine; this reaction probably implies the formation of a methylenecyclopropane which has been isolated in one case.
L. Toupet and R. Carrié, J. Chem. Soc., Chem. Commun., 1975, 384 DOI: 10.1039/C39750000384
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