title: Olefination and group transfer reactions of an electron deficient tantalum methylidene complex.
abstract: The reactivity of an electronically unsaturated tantalum methylidene complex [TolC(NSiMe(3))(2)](2)Ta(CH(2))CH(3) supported by [TolC(NSiMe(3))(2)] amidinate ligands is described. Electrophilic addition and olefination reactions of the Ta=CH(2) functionality are reported. Alkylidene participates in group-transfer reactions not observed in sterically similar, but electronically saturated, analogues. Reactions with substrates containing unsaturated C-X (X = C, N, O) bonds yield [Ta]=X compounds and vinylated organic products; carbon-sulfur cleavage reactions to produce tantalum thioformaldehyde and tantalum sulfido complexes.
authors.affiliation: Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA.
authors.forename: Sarah M
authors.initials: SM
authors.lastname: Mullins
authors.forename: Robert G
authors.initials: RG
authors.lastname: Bergman
authors.forename: John
authors.initials: J
authors.lastname: Arnold