Organophosphorus compounds 115. Solvent-directed cooligomerization of kinetically stabilized phosphaalkynes with trialkylaluminium compounds

Abstract The reaction of phosphaalkynes 1 with trialkylaluminium reagents 4 in diethyl ether leads to a highly selective phosphaalkyne cyclotetramerization with incorporation of one organometallic unit (→ 6a - c ). When the tetracyclic compound 6a is allowed to react with nonacarbonyldiiron ( 7 ), a two-fold metalation followed by a rearrangement of the cage compound occurs and the transition metal complex 8 is obtained.