Intermetal exchange of oxo, imido and alkylidene ligands

Abstract

Oxo, imido and alkylidene ligand-exchange reactions occur readily between the co-ordinatively unsaturated centres of MQ2X2(M = Mo or W; Q = O, NR or CHR′; X = OBut) and M(η-C5R″5)QX2(M = Nb or Ta; Q = NR or CHR′; X = Cl or OBut) compounds (R = C6H3Pri2-2,6, R′= CMe2Ph or But, R″= H or Me); a kinetic study of the reaction between MoO2(OBut)2 and Mo(NR)2(OBut)2 indicates that the exchange proceeds via a four-centre transition state.