Terminal acetylenes RC-CH are transformed catalytically into metathesis products RC=CR and C2H2 on the carbyne complex [W(CBU~)(OSU~)~], a process which is rapidlyfollowed by a polymerization of the alkyne; in the case of sterically hindered ButC-CH, a stoichiometric reaction is observed, by which a dinuclear compound p-C2H2[W(OBut)& 1 and the deprotiotungstenacyclobutadiene [ W C 3 ( B ~f ) 2 ( 0 B ~t ) 2 ] 2 are formed.
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