An unprecedented regiospecific attack of phosphorus nucleophiles at Cα of the allenyl ligand in [Fe2(CO)6(µ-PPh2){µ-η1 : η2α,β-(H)CαCβCγH2}]

Abstract

The binuclear allenyl complex [Fe₂(CO)₆(µ-PPh₂)-{µ-η¹ : η²-(H)C_αC_βC_γH₂}] 1 reacts with PPh₂H and PPhH₂ to afford [Fe₂(CO)₆(µ-PPh₂){µ-η¹ : η²-(Me)CCH(PPh₂)}] 2 and [{Fe₂(CO)₆(µ-PPh₂)-(µ-η¹ : η²-(Me)CCH)}₂PPh] 3 respectively both of which contain µ-η¹ : η²-coordinated phosphino-substituted alkenyl ligands formed via an unprecedented regiospecific attack of phosphorus nucleophiles at C_α of the µ-η¹ : η²-coordinated allenyl followed by a facile 1,4-hydrogen migration.