title: Reactions of rac-(ebthi)M(η(2) -Me3 SiC2 SiMe3 ) (M=Ti, Zr) with aryl nitriles.
abstract: The reactions of the Group 4 metallocene alkyne complexes rac-(ebthi)M(η(2) -Me3 SiC2 SiMe3 ) (1 a: M=Ti, 1 b: M=Zr; rac-(ebthi)=rac-1,2-ethylene-1,1'-bis(η(5) -tetrahydroindenyl)) with PhCN were investigated. For 1 a, an unusual nitrile-nitrile coupling to 1-titana-2,5-diazacyclopenta-2,4-diene (2) at ambient temperature was observed. At higher temperature, the CC coupling of two nitriles resulted in the formation of a dinuclear complex with a four-membered diimine bridge (3). The reaction of 1 b with PhCN afforded dinuclear compound 4 and 2,4,6-triphenyltriazine. Additionally, the reactivity of 1 b towards other nitriles was investigated.
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany).
authors.forename: Lisanne
authors.initials: L
authors.lastname: Becker
authors.forename: Perdita
authors.initials: P
authors.lastname: Arndt
authors.forename: Anke
authors.initials: A
authors.lastname: Spannenberg
authors.forename: Uwe
authors.initials: U
authors.lastname: Rosenthal
keywords: CC coupling; bridging ligands; metallacycles; nitrile-nitrile coupling; triazines