Addition of alkynes to (vinylketene)tricarbonyliron(0) complexes

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Abstract
Alkynes add to (vinylketene)tricarbonyliron(0) 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-1-oxapenta-1,2,4-triene)tricarbonyliron(0), and of the structurally modified product derived from diethylpropynylamine and (3-isopropyl-5-phenyl-1-oxapenta-1,2-4-triene)tricarbonyliron(0).