The lithium salt of tris(trimethylsilyl)cyclopentadienyl tri-carbonyl molybdenum anion Li^+[{η^5-(Me~3Si)~3C~5H~2} Mo(CO)~3]^- (1), reacted respectively with CH3~I, phCH~2Cl, and ClCH~2COOC~2H~5 to give the corresponding alkylated molybdenum products [{η^5-(Me~3Si)~3C~5H~2}Mo(CO)~3R], (R:CH~3, 2; phCH2~, 3; CH~2COOC~2H~5, 4). In the reaction of 1 with PCl~3, except for a small amount of the expected molybdenum chloride [{η^5-(Me~3Si)~3C~5H~2} Mo(CO)~3Cl] (6), the molybdenum phosphochloride [{η^5-(Me~3Si)~3C~5H~2} Mo(CO)~3PCl~2] (5) became the main product. 1 reacted with iodine to yield the molybdenum iodide [{η^5-(Me~3Si)~3C~5H~2}Mo(CO)~3I] (7). 1 was treated with HOAc and followed by the reaction respectively with CCl~4 and NBS, only the products - desilylating one of the three silyl groups were afforded [{η^5-(Me~3Si)~2C~5H~3}Mo(CO)~3X], (X:Cl, 8; Br, 9). The molecular structures of 2-6 were characterized by elemental analysis, IR and 1H NMR spectra.

Key words: METAL HALIDE, TRIMETHYLSILANES, MOLYBDENUM ION, MOLYBDENUM, ORGANO MOLYBDENUM COMPOUNDS, MOLYBDENUM CARBONYL, CYCLOPENTADIENE P, ANION, REACTIVITY