REACTIONS OF THE TUNGSTEN ALKYLIDYNE COMPLEXES [W(CCCR)(CO)2(ETA-C5H5)] (R = C6H4ME-4 OR BUT)

The compound [W(=CC=CC6H4Me-4)(CO)2(eta-C5H5)] has been prepared, and its reactions with aqueous HI and with HBF4 . Et2O in the presence Of [NEt4][W(=CC6H4 Me-4)(CO)2(eta-5-C2B9H9Me2)] investigated. The former reaction affords the alkylidene-tungsten complex [W{=C(H)C=C6H4Me-4}(l)(CO)2)eta-C5H5)], and the latter reaction the ditungsten species [W2(mu-CC=CC6H4Me-4)(CO)4{eta-5-C2B9H8(CH2C6H4Me-4)Me2}(eta-C5H5)]. Similar protonation reactions of [W(=CC=CBUt)(CO)2(eta-C5H5)] with HI, and with HBF4.Et2O in the presence of the salts [NEt4][W(=CR)(CO)2(eta-5-C2B9H9Me2)] (R = C6H4Me-4 or Me), afford the complexes [W{=C(H)C=CBut}(l)(CO)2(eta-C5H5)] and [W2(mu-CC=CBut)(CO)4{eta-5-C2B9H8(CH2R)Me2}(eta-C5H5)], respectively.