Reactions of [Ru(thf)(PPh&(q-C,H,)1[PF6) with buta-1,4-diyne in the presence of nucleophiles give alkenylvinylidene or allenylidene complexes; the results are rationalised in terms of the formation of the intermediate trienylidene cation [Ru(C=C=C=CHz)-(PPh3)2(q-CSHS)]+ which undergoes nucleophilic addition at C,; the X-ray structure of the heteroallenylidene [Ru{C=C=CMe(NPh2)}(PPh~)2(q-C~H5)][PF6] 2 is determined.
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