SYNTHESIS AND CHARACTERIZATIONS OF P-XYLYL BRIDGED DINUCLEAR COMPLEXES OF MOLYBDENUM AND TUNGSTEN - THE CRYSTAL-STRUCTURE OF -ME-3-SIME3-CYCLOPENTADIENYLTRICARBONYLMOLYBDENUM)

The reactions of (RRCpM)-R-1-Cp-2(CO)(3)-Li+ (M = Mo, W) with alpha,al pha'-dichloro-p-xylene yielded p-xylyl bridged dinuclear complexes of (RRCpM)-R-1-Cp-2(CO)(3) in high yields. All of such new complexes are very stable to air and water. Some of them are stable even in dilute a cids and dilute bases. Complex 4 crystallizes in the monoclinic system , space group P2(1)/n, with a = 6.847(5) Angstrom, b = 9.838(2) Angstr om, c = 25.140(10) Angstrom, beta = 96.56(5)degrees, Z = 2, R-F = 0.07 7, R-w = 0.105 and V = 1682.4(14) Angstrom(3).