Reaction of the cyclopropenylidene complexes (1) with pyridinium ylides gives stable pyran-2-ylidene complexes (3), a new type of carbene complex stabilised by 6π-electron delocalisation; some reactions of these complexes are described.
C. W. Rees and E. von Angerer, J. Chem. Soc., Chem. Commun., 1972, 420 DOI: 10.1039/C39720000420
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