Reaction of 1,2-Bis(tetramethylcyclopentadienyl)tetramethyldisilane with Hexacarbonyl Molybdenum

1,2-Bis(tetramethylcylclopentadienyl)tetramethyldisilane reacted sequentially with n-BuLi and Mo(CO)6 to generate 1,1 prime -(tetramethyldisilandiyl)bis[tetramethylcyclo-pentadienyltricarbonyl molybdenum anion salt], (Me2SiMe2Si)[Me4CpMo(CO)3 -Li+](I). The further reaction of I with acetic acid, followed by halogenation with CCl4, NBS or I2 respectively yielded the corresponding molybdenum-halogen derivatives, (Me2SiMe2Si)[Me4CpMo(CO)3 X] 2, [X=Cl(1), Br(2), I(3)]. The reaction of compound I with MeI yielded the methylmolybdenum complex (Me2SiMe2Si) [Me4CpMo (CO)3Me]2 (4). Strangely, the reaction of I directly with I2 gave the desilanyl product Me4CpMo(CO)3I (5). The molecular structures of compound 1-5 were characterized by elemental analyses, IR and 1H NMR spectra.