Reaction of η4-vinylketen iron complexes with carbon monoxide or tertiary phosphines. Intramolecular carbonylation–decarbonylation rearrangement of the vinylketen skeleton induced by co-ordination of a ligand: X-ray crystal structure of FeCOCH2C(CO2Me)C(OMe)(CO)3(PPhMe2)

Abstract

The (η⁴-vinylketen)tricarbonyliron complexes (1c) and (1d) react with L′(L′= CO or PR₃) to afford the ferracyclopent-2-en-5-ones (4)–(6) by an unusual intramolecular carbonylation–decarbonylation rearrangement of the vinylketen skeleton, induced by the co-ordination of L′; the structure of (5) was determined by X-ray analysis.