Protonation at one of the phenylacetylide substituents of the allylic complexes [W(cp) (CO),{q3-H,CC[C(C=CPh),] CH,R}] (cp = q-C5H5), including the first cationic tungsten-ruthenium allylic vinylidene complex, R = C( Ph)=C=Ru (cp) (PPh,), (crystal structure), gave q4-vinylallene complexes.
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