Conversion of (vinylketene)tricarbonyliron(0) complexes into (vinylallene)tricarbonyliron(0) complexes

Abstract

Addition of phosphonoacetate anions to (vinylketene)tricarbonyliron(0) complexes gave (vinylallene)tricarbonyliron(0) complexes; stereoselectivity as high as 98 : 2 was observed and the relative stereochemistry of the major stereoisomers was elucidated by X-ray crystal structure analysis of the major isomer of [PhCHCHC(Me)CCHCO₂BU^t](CO)₃Fe⁰3d, the product obtained from the reaction between [PhCHCHC(Me)CO](CO)₃Fe⁰1a and the anion of (EtO)₂P(O)CH₂CO₂Bu^t2b.