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Alkoxycarbene complexes of tungsten, e.g. (CO) 5 W C(CH 3 )OEt (13) react with 1,2- and 1,4-dihydropyridines, to give, upon transfer of a hydride to the carbene carbon, elimination of ethanol, and readdition of pyridine to an unstable alkylidene complex (CO) 5 W C(H)CH 3 (22), pyridinium ylide complexes of the type (CO) 5 W - -C(H)(CH3)Py + ...