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.