title: Synthesis, structure and catalytic activity of a gold(I) complex containing 1,2-bis(diphenylphosphino)benzene monoxide.
abstract: The gold(I) complex [Au(dppbO)Cl] was synthesized by reaction of Na[AuCl4]·2H2O with 1,2-bis(diphenylphosphino)benzene (dppb) in the presence of water. This is a new method for the synthesis of a bisphosphine monoxide gold(I) complex. The new gold(I) complex was characterized by NMR spectroscopy and X-ray crystal structure analysis. In the solid state structure a relatively short contact between the oxygen atom of the phosphine oxide group and the gold center was observed. The catalytic activity of [Au(dppbO)Cl] was tested for three different intermolecular alkyne hydrofunctionalization reactions. Silver tetrafluoroborate was used as co-catalyst for halide abstraction. While the bisphosphine monoxide gold(I) complex showed moderate activity for the hydration of various alkynes and the hydroamination of phenyl acetylene, high activity was observed for the hydroarylation of ethylpropiolate. Electron-rich arenes add very fast to the C-C triple bond but with relatively low selectivity.
authors.affiliation: Department of Chemistry, Texas A&M University-Kingsville, 700 University Blvd., Kingsville, Texas 78363, USA. christine.hahn@tamuk.edu.
authors.forename: Christine
authors.initials: C
authors.lastname: Hahn
authors.forename: Leticia
authors.initials: L
authors.lastname: Cruz
authors.forename: Amanda
authors.initials: A
authors.lastname: Villalobos
authors.forename: Liliana
authors.initials: L
authors.lastname: Garza
authors.forename: Samuel
authors.initials: S
authors.lastname: Adeosun
mesh_terms: D000480:Alkynes / Q000737:chemistry; D001555:Benzene Derivatives / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D006046:Gold / Q000737:chemistry*; D008968:Molecular Conformation; D063065:Organophosphonates / Q000737:chemistry*
chemical_list: C519449:1,2-bis(diphenylphosphino)benzene; D000480:Alkynes; D001555:Benzene Derivatives; D056831:Coordination Complexes; D063065:Organophosphonates; D006046:Gold