Synthesis and Crystal Structures of Two Isomerically Pure Organotransition-Metal [60]Fullerene Derivatives Containing dppb Ligands: mer-M(CO)3(dppb)(η2-C60) (M = Mo, W)

The reaction of M(CO) 3 (CH 3 CN) 3 (M = Mo, W) with an equimolar quantity of 1,2-bis(diphenylphosphino)benzene (dppb) results in formation of fac -M(CO) 3 (dppb) (CH 3 CN) ( 1, M = Mo, 73%; 2, M = W, 62%). Interaction of 1 or 2 with [60]fullerene in chlorobenzene at about 80 °C gives the isomerically pure isomers mer -M(CO) 3 (dppb)(η 2 -C 60 ) ( 3, M = Mo, 76%; 4, M = W, 66%). All the new compounds 1 − 4 have been characterized by elemental analysis and spectroscopic methods, as well as by single-crystal X-ray diffraction analysis for 3 and 4 .