An unprecedented regiospecific attack of phosphorus nucleophiles at C-alpha of the allenyl ligand in [Fe-2(CO)(6)(mu-PPh(2)){mu-eta(1):eta(2)(alpha,beta)-(H)C-alpha=C-beta=C gamma H2}] - Doherty, S; Elsegood, M; Clegg, W; Scanlan, T; Rees, N (1996)