Organolanthanoid activation of carbon monoxide: single and multiple insertion of CO into t-butyl lanthanoid bonds; X-ray crystallographic identification of a new bonding mode for a bridging enedione diolate ligand formed by formal coupling of four CO molecules

Abstract

Carbon monoxide (1 equiv.) reacts with (C5H5)2– Lu(CMe3)(OC4H8) at room temperature to form the isolable dihaptoacyl complex (C5H5)2LU(η2-COCMe3), which reacts with additional CO to form the crystallographically characterized bimetallic complex (C5H5)2LuO4C12H18Lu-(C5H5)2 in which the two metals are bridged by the enedionediolate ligand 4,5-dihydroxy-2,2,7,7-tetramethyl-oct-4-ene-3,6-dionato (2–), which forms 6-membered metallocyclic rings with each metal atom.