Intramolecular Addition of Monomeric Arylcopper Entities on an Alkyne Grouping in Complexes [h5-C5H4SiMe3)2Ti(C=CSiMe3)2]CuR; X-ray Structure of [h5-C5H4SIMe3)2Ti(C=CSiMe3({m-C=C(SiMe3)(C6H3(CH2NMe2)2-2,6)}Cu]

Abstract

The tetranuclear heteroleptic arylcopper aggregate [Cu{4}R{2}Br{2}] (R = C{6}H{3}(CH{2}NMe{2}){2}-2, 6) reacts with the organometallic 1,4-diyne [(@h}5{-C{5}H{4}SiMe{3}){2}Ti(C@8CSiMe{3}){2}], 1, to give equivalent amounts of known [1 . CuBr], and the novel 1,1-bis-metalla alkenyl complex [(@h}5{-C{5}H{4}SiMe{3}){2}Ti(C@8CSiMe{3}){@m-C=C(SiMe{3})(R)}Cu], 6, that is the result of intramolecular addition of a Cu-C bond across the alkyne triple bond.