Water-compatible gold and silver nanoparticles as catalysts for the oxidation of alkenes. (14th December 2016)

• Record Type: Journal Article
• Authors: Fisher, Eugenia; Kenisgberg, Lea; Carreira, Monica; Fernández-Gallardo, Jacob; Baldwin, Richard; Contel, María
• Is Part Of: Polyhedron. Volume 120(2016)
• Page Start: 82
• Page End: 87
• Publication Date: 2016-12-14
• Subjects: Oxidative cleavage -- Alkenes -- Gold -- Silver -- Nanoparticles; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2016.06.012
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Water-compatible Ag/Au nanoparticles (NP) catalyze the liquid-phase oxidation of 1, 1-diphenylethylene in H2 O at 90 °C with TBHP (tert-butylhydroperoxide) as co-oxidant. Conversions of up to 100% to benzophenone were obtained with 1.5 mol% of these Au or Ag NP (10 nm) further supported on functionalized silica. The systems could be recycled. Abstract: Water-compatible Ag/Au nanoparticles (NP) catalyze the liquid-phase oxidation of 1, 1-diphenylethylene to afford benzophenone, the product of oxidative cleavage, and 1, 1-diphenylepoxide. The metal nanoparticles are surface functionalized with tannic acid and/or citrate and have diameters of 10–12 nm. By proper selection of the reaction conditions, percent conversions/distributions of 85–100% of 1, 1-diphenylethylene can be achieved at 90 °C using water as a solvent and TBHP (tert-butylhydroperoxide) as the co-oxidant. In addition, these nanoparticles have been further supported on functionalized silica to improve their stability and recyclability in this oxidation process. Conversions of up to 100% to benzophenone could be obtained with 1.5 mol% Au or Ag nanoparticles (10 nm) supported on functionalized silica. The supported NP could be recycled and re-used without significant catalytic activity loss for three runs.