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Treatment of thf (tetrahydrofuran) solutions of [MBr(CO),(NCMe),(q3-C3H5)] (M = Mo or W) with Na,[7,8-C,BgH,R',] (R' = H or Me), followed by addition of [N(PPh,),]CI or [NEtJCI, afforded the salts [Y][M(CO),(q3-C3H5)(q5-7,8-C,BgH,R',)] [Y = N(PPh,),, R' = Me, M = M o l a or W 1b; Y = NEt,, R' = H, M = Mo 1 c] in high yield. These species may be synthesised, but in lower yield, from allyl bromide and TI,[M(C0)3(q5-7,8-C,BsHsR'2)] generated in situ. Protonation of the salts 1 a and 1 b with HBF,*Et,O in the presence of CO or PPh, yielded the compounds [ M (CO),L,(q5-7.8-C,BgHgMe2)] ( M = Mo 2a or W

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Treatment of the complex [Mo(CO),(NCMe),(q5-C9H7)] [BF,] (C9H7 = indenyl) with the salts [NEt,] [W(-CC=CBut)(CO),(q5-C2BgH9Me2)] and [NEt,] [MO(%CC,H,Me-4) (CO){P(OMe),)-(q5-C2B9H9Me2)] in CH2CI, affords, respectively, the dimetal compounds [MoW(p-CCzCBut) -Similarly, reactions between the salts [ N Et , , ] [ M ( K R ) (CO),(q5-C2B9H,R~)] (M = M o or W, R =