Reaction of 1,1 '-bis(tetramethylcyclopentadienyl) ferrocene with pentacarbonyl iron and triacetonitrile tricarbonyl molybdenum

The xylene solution of 1,2-bis (tetramethylcyclopentadienyl) ferrocene, 1,1 '-Fe(Me4Cp)(2)(I) and Fe(CO)(5) was refluxed for 10 h to yield ferrocene-br idged bis (tetramethylcyclopcntadienyl) tetracarbonyl, 1,1'-Fc[(Me4Cp)Fe(CO )(2)](2) (1). Futher reaction of compound 1 with I-2 in chloroform to yield Fe-Fe bond cleaved product, 1,1'-Fc[(Me4Cp)Fe(CO)(2)I](2)(2). compound I r eacted sequentially with n-BuLi and Mo(MeCN)(3)(CO)(3) to generate 1,1'-Feb is [tetramethylcyclopentadienyltricarbonyl molybdenum anion salt], 1,1'-Fc( Me4Cp)Mo(CO)(3)-Li+](2) (II), Futher reaction of compound II with Mel yield ed the corresponding methylmolybdenum complex, 1,1'-Fc[(Me4Cp) Mo(CO)(3)Me] (2) (3), The reaction of compound II with BrCH2CH2Br did not gave the expec ted Mo-Mo binuclear compound, instead a small quantity of ferrocene-bridged bis(molybdenum-bromide) compound, 1,1'-Fc[(Me4CpMo(CO)(3)Br](2)(4), which was isolated by nucleophilic substitution and elimination mechanism. The mo lecular structures of compounds 1-4 were characterized by elemental analyse s, IR and H-1 NMR spectra, The crystal structure of compound 1 was determin ed by X-ray diffraction.