Commun ,612 (1970) (13) A reviewer has suggested t h a t we should mention the concerted and/ or termolecular mechanism suggested by Douek and Wilkinson 8 We find the arguments of these authors unconvincing and believe t h a t a simple bimoleculai displacment of halide ion operates in oui system a t least The new compounds H3SiCr(C0)8(r-C6H5), H~S~M O ( C O )~( T -C~H~) , and H3SiW(C0)3(~-C6HS) were synthesized by the reaction of H3SiBr with KM'(CO)a(~-C&15) (where M' = Cr, Mo, W). The thermal stability of the compounds was ex-amined. The silicon-transition metal bond was cleaved a t room temperature by water and hydrogen chloride and a t slightly elevated temperatures by dimethylamine. Trimethylamine and dimethylamine formed adducts which were stable a t room temperature

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