Synthetic routes to butadienyl complexes. Double addition of methylene to an acetylide and hydrometallation of an ene–yne. X-Ray crystal structure of [Fe2(CO)5{µ-η2,η3-H2CC(Me)CCH2}(µ-PPh2)]

Abstract

Binuclear butadienyl complexes [Fe₂(CO)₅{µ-η²,η³-H₂CC(R)CCH₂}(µ-PPh₂)](R = Bu^t, Me) have been synthesized via double addition of CH₂ fragments to an acetylide in [Fe₂(CO)₆(µ-η¹,η²-CCBu^t)(µ-PPh₂)] or hydrometallation of the ene–yne CH₂C(Me)CCH with [HFe₂(CO)₇(µ-PPh₂)].