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Alkynes add to (vinylketene)tricarbonyliron(O) complexes to generate stable adducts; addition of unsymmetrical alkynes is highly regioselective and the regiochemistries of the adducts produced in these reactions were determined by X-ray crystal structure analyses of the major isomer derived from but-3-yn-2-one and (3-tert-butyl-5-phenyl-I -0xapenta-I ,2,4-triene)tricarbonyIiron(O), and of the structurally modified product derived from diethylpropynylamine and (3-isopropyl-5-phenyl-I -0xapenta-I ,2-4-triene)tricarbonyIiron(O).

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