title: Synthesis and catalytic applications of 1,2,3-triazolylidene gold(i) complexes in silver-free oxazoline syntheses and C-H bond activation.
abstract: A series of novel 1,2,3-triazolylidene gold(i) chloride complexes have been synthesised and fully characterised. Silver-free methodologies for chloride ion abstraction of these complexes were evaluated for their potential as Au-based catalyst precursors. Using simple potassium salts or MeOTf as chloride scavengers produced metal complexes that catalyse both the regioselective synthesis of oxazolines and the C-H activation of benzene or styrene for carbene transfer from ethyl diazoacetate. These results indicate that Ag-free activation of 1,2,3-triazolylidene gold(i) chloride complexes is feasible for the generation of catalytically active Au triazolylidene species. However, silver-mediated activation imparts substantially higher catalytic activity in oxazoline synthesis.
authors.affiliation: Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland. perez@dqcm.uhu.es martin.albrecht@dcb.unibe.ch.
authors.forename: René
authors.initials: R
authors.lastname: Pretorius
authors.forename: Manuel R
authors.initials: MR
authors.lastname: Fructos
authors.forename: Helge
authors.initials: H
authors.lastname: Müller-Bunz
authors.forename: Robert A
authors.initials: RA
authors.lastname: Gossage
authors.forename: Pedro J
authors.initials: PJ
authors.lastname: Pérez
authors.forename: Martin
authors.initials: M
authors.lastname: Albrecht