SYNTHESIS OF ORGANOTRANSITION-METAL COMPLEXES CONTAINING P-METHOXYCARBONYLBENZOYLCYCLOPENTADIENYL AND THOXYCARBONYLPHENYL(HYDROXYMETHYL)CYCLOPENTADIENYL LIGANDS FROM SODIUM P-METHOXYCARBONYLBENZOYLCYCLOPENTADIENIDE - X-RAY STRUCTURE OF ETA(5)-P-MEO2CC6H4COC5H4MO(CO)(3)I

A new functionally substituted cyclopentadienyl salt p-MeO2CC6H4COC5H4 Na (1) was prepared from cyclopentadienylsodium and dimethyl terephtha late in THF, and which might be utilized to synthesize a series of nov el transition metal complexes containing difunctional group-substitute d cyclopentadienyl ligands; 1 reacted with M(CO)(6)(M = Mo, W) followe d by treatment with PBr3 or I-2 to give mononuclear organomolybdenum ( or tungsten) halides eta(5)-p-MeO2CC6H4COC5H4M(CO)(3)X(2, M = Mo, X = Br; 3, M = W, X = Br; 4, M = Mo, X = I; 5, M = W, X = I), whereas reac tion of 1 with W(CO)(6) and successive treatment with selenium powder and MeI or PhCH2Cl afforded mononuclear organotungsten selenolate comp lexes eta(5)-p-MeO2CC6H4COC5H4W (CO)(3)SeMe (6) and eta(5)-p-MeO2CC6H4 COC5H4W(CO)(3)SeCH2Ph (7). In addition, 1 reacted with M(CO)(6)(M = Mo , W) followed by treatment with FeCo2(CO)(9)(mu(3)-S) to produce the c orresponding polynuclear complexes eta(5)-p-MeO2CC6H4CoC5H4FeCo(CO)(8) (mu(3)-S) (8, M = Mo; 9, M = W), which could be converted with NaBH4 i nto hydroxyl derivatives eta(5)-p-MeO2CC6H4CH(OH)C5H4MFeCo(CO)(8)(mu(3 )-S) (10, M = Mo; 11, M = W). All the new transition metal complexes 2 -11 have been fully characterized by elemental analysis, IR and H-1 NM R spectroscopy, as well as for 4 by an X-ray diffraction analysis.