REACTIONS OF DINUCLEAR AND POLYNUCLEAR COMPLEXES .15. REINVESTIGATIONOF THE REACTION BETWEEN [CPMO(CO)(3)H], ALLYL CHLORIDE AND DIMETHYL DISULFIDE - CRYSTAL-STRUCTURE OF MO(CO)(MU-SME)(3)MO(CO)(2)(MU-SME)MO(CO)(2)(C5H5)]

The thermal reaction of [C5H5Mo(CO)(3)H] with dimethyl disulfide and a llyl chloride has been reinvestigated. In addition to the expected cat ionic species [(C5H5)(2) Mo-2(mu-SMe)(3)(CO)(2)]Cl (1), the new trinuc lear complex Mo(CO)(mu-SMe)(3)Mo(CO)(2)(mu-SMe)Mo(CO)(2)(C5H5)] (2) wa s obtained. An X-ray diffraction study showed that 2 contains a (C5H5) (CO)Mo(mu-SMe)(3)Mo(CO)(2) core in which the triply bridged Mo-Mo bond is of normal length (2.800(1) Angstrom). This core is linked to the C 5H5Mo(CO)(2)SMe unit via its sulfur atom and through an unusually weak Mo-Mo bond of 3.115(2) Angstrom, the Mo-Mo-Mo angle being 144.5(1)deg rees.