SYNTHESIS OF ORGANOTRANSITION METAL COMPLEXES CONTAINING p-METHOXYCARBONYLBENZOYLCYCLO-PENTADIENYL AND p-METHOXYCARBONYLPHENYL (HYDROXYMETHYL)CYCLOPENTADIENYL LIGANDS FROM SODIUM p-METHOXYCARBONYLBENZOYLCYCLO-PENTADIENIDE. X-RAY STRUCTURE OF η5-p-MeO2CC6H4COC5H4Mo(CO)3I

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Abstract
A new functionally substituted cyclopentadienyl salt p-MeO2CC6H4COC5H4Na (1) was prepared from cyclopentadienylsodium and dimethyl terephthalate in THF, and which might be utilized to synthesize a series of novel transition metal complexes containing difunctional group-substituted cyclopentadienyl ligands; 1 reacted with M(CO)6(M = Mo, W) followed by treatment with PBr3 or I2 to give mononuclear organomolybdenum (or tungsten) halides η5-p-MeO2CC6H4COC5H4M(CO)3X(2, M = Mo, X = Br; 3, M = W, X = Br; 4, M = Mo, X = I; 5, M = W, X = I), whereas reaction of 1 with W(CO)6 and successive treatment with selenium powder and MeI or PhCH2Cl afforded mononuclear organotungsten selenolate complexes η5-p-MeO2CC6H4COC5H4W (CO)3SeMe (6) and η5-p-MeO2CC6H4COC5H4W(CO)3SeCH2Ph (7). In addition, 1 reacted with M(CO)6(M = Mo, W) followed by treatment with FeCo2(CO)9(μ3-S) to produce the corresponding polynuclear complexes η5-p-MeO2CC6H4COC5H4MFeCo(CO)8(μ3−S) (8, M = Mo; 9, M = W), which could be converted with NaBH4 into hydroxyl derivatives η5-p-MeO2CC6H4CH(OH)C5H4MFeCo(CO)8(μ3−S) (10, M = Mo; 11, M = W). All the new transition metal complexes 2–11 have been fully characterized by elemental analysis, IR and 1H NMR spectroscopy, as well as for 4 by an X-ray diffraction analysis.

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