CONDENSATION OF CYCLOPENTADIENE WITH BRIDGING HYDROXO ORGANOPALLADIUMAND ORGANOPLATINUM DIMERS - A NOVEL SIMPLE ENTRY TO ETA(5)-CYCLOPENTADIENYL COMPLEXES OF PALLADIUM AND PLATINUM

Dinuclear complexes of palladium and platinum, containing two bridging hydroxo ligands, [L2M2Ph2(mu-OH)2], where M = Pd, Pt and L = Ph3P, Cy 3P, readily react with cyclopentadiene or methylcyclopentadiene to giv e the corresponding eta5-cyclopentadienyl complexes, [(eta5-C5H4Y)M(Ph )L] (Y = H, Me), 2a-d and 3, in 65-95 % yield. This novel method does not require any organometallic reagents for the Cp transfer to palladi um and platinum. Complex 2a (M = Pd, L = PPh3, R = H), was structurall y characterized by single crystal diffraction. Crystallographic data f or 2a: space group C2/c, a = 32.934(13) angstrom, b = 9.736(2) angstro m, c = 18.355(8) angstrom, alpha = 90.00-degrees, beta = 120.16(3)degr ees, gamma = 90.00-degrees, V = 5089(3) angstrom3, Z = 8, R = 0.056, a nd R(w) = 0.067.