Abstract: 1,2-Bis(tetramethylcylclopentadie reacted sequentially with n-BuLi and Mo(CO)₆ to generate 1,1'-(tetramethyldisilandiyl ) bis [tetramethylcyclo-pentadienyltricarbony bdenum anion salt], (Me₂SiMe₂Si) [Me₄CPMo(CO)₃-Li⁺] (I). The further reaction of Iwith acetic acid, followed by halogenation with CCl₄, NBSor I₂ respectively yielded the corresponding molybdenum-halogen derivatives, (Me₂SiMe₂Si) [Me₄CpMo(CO)₃X]₂, [X=Cl(1), Br(2), I (3)]. The reaction of compound Iwith MeIyielded the methylmolybdenum complex (Me₂SiMe₂Si ) [Me₄CpMo (CO )₃Me]₂, (4). Strangely, the reaction of Idirectly with I₂ gave the desilanyl product Me₄CpMo(CO)₃I(5). The molecular structures of compound 1-5 were characterized by elemental analyses, IRand ¹H NMRspectra.

Key words: 1,2-Bis (tetramethylcylclopentadienyl) tetramethyldisilane, Bridged bisnuclear molybdenum compound, Desilylation