title: Supported gold nanoparticles catalyzed cis-selective semihydrogenation of alkynes using ammonium formate as the reductant.
abstract: TiO2 supported gold nanoparticles with low loading (0.5 mol%) are able to semihydrogenate non-fluorinated and gem-difluorinated alkynes to cis-alkenes with high selectivity, using cost-effective and easy-to-handle ammonium formate as the reductant. No over-reduction was observed. The good recyclability of Au/TiO2 allows for "green" semireduction of alkynes. A difluorinated pyran and α,β-unsaturated δ-lactone were easily prepared from the obtained gem-difluoro alkene building blocks.
authors.affiliation: Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA. gb.hammond@louisville.edu.
authors.forename: Shengzong
authors.initials: S
authors.lastname: Liang
authors.forename: Gerald B
authors.initials: GB
authors.lastname: Hammond
authors.forename: Bo
authors.initials: B
authors.lastname: Xu