Recyclable Gold Research Articles

Perfluoro‐Tagged Gold Nanoparticles Immobilized on Fluorous Silica Gel: A Reusable Catalyst for the Benign Oxidation and Oxidative Esterification of Alcohols

A recyclable gold catalyst is prepared by immobilization of perfluoro-tagged gold nanoparticles on fluorous silica gel and used in the oxidation of alcohols as well as in domino oxidation/cyclization processes and in the direct oxidative conversion of alcohols to esters under an oxygen atmosphere. The oxidation is also possible under solvent-free conditions.

Magnetically Separable Gold Catalyst for the Aerobic Oxidation of Amines

AbstractA magnetically separable, recyclable gold catalyst consisting of gold nanoparticles supported on intimately mixed superparamagnetic ceria/iron oxide has been prepared by simple addition of the preformed mixed oxide support and the gold precursor, Au(OAc)3, to the reaction mixture of the aerobic oxidation of amines. The catalyst was characterized by means of X‐ray diffraction (XRD), N2 adsorption, superconducting quantum‐interference device (SQUID) measurements, time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS), scanning transmission electron microscopy (STEM), and scanning electron microscopy with an energy‐dispersive X‐ray spectrometer (SEM‐EDAX). Catalytic tests with various amines showed high selectivity to the corresponding imines (87–100 %), and good separation efficiency and recyclability of the catalyst.

ChemInform Abstract: Recyclable Gold Nanoparticle Catalyst for the Aerobic Alcohol Oxidation and C—C Bond Forming Reaction Between Primary Alcohols and Ketones under Ambient Conditions.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Recyclable gold nanoparticle catalyst for the aerobic alcohol oxidation and C–C bond forming reaction between primary alcohols and ketones under ambient conditions

A recyclable gold catalyst is synthesized from readily available reagents by immobilizing gold nanoparticles in aluminum oxyhydroxide support through a simple sol–gel method. The catalyst showed the high activity even at room temperature in the aerobic oxidation of various alcohols and in the coupling reaction between primary alcohols and ketones.