Extensive density-functional theory calculations, and taking into account temperature and pressure, afford a comprehensive picture of the behavior and interaction of oxygen and Ag(111), and provides valuable insight into the function of silver as an oxidation catalyst. The obtained phase diagram reveals the most stable species present in a given environment and thus identifies (and excludes) po...

Catalytic asymmetric Corey-Chaykovsky epoxidation of various ketones with dimethyloxosulfonium methylide using a heterobimetallic La-Li(3)-BINOL complex (LLB) is described. The reaction proceeded smoothly at room temperature in the presence of achiral phosphine oxide additives, and 2,2-disubstituted terminal epoxides were obtained in high enantioselectivity (97%-91% ee) and yield ( > 99%-88%) f...

The oxidation of 2-Methylnaphthalene (2-MN) was carried out in actic acid with 30%H2O2. 2-Methyl-1,4Naphthoquinone (2-MNQ) was obtained in a yield of 81.3% when sulfric acid used as catalyst. The aromatic substituted pathway is speculated as the dominated oxidation pathway with a higher conversion than the epoxidation one due to the activity of CH3CO3H2 + formed by actic acid and H+ supplied fr...

Methyl(trifluoromethyl)dioxirane (TFDO) can be used for the oxyfunctionalization of SWCNTs filled with NaI and LuCl₃ under mild conditions. The chosen metal halides are of interest for theranostics, both for imaging and therapy when in their radioactive form. The applied functionalization methodology does not require metal catalyst, preserves the integrity of the nanotubes during treatment, avo...

The discovery of heterogeneous catalysts synthesized in easy, sustainable ways for the valorization olefins derived from renewable biomass is attractive environmental, sustainability, and economic viewpoints. Here, an organic–inorganic hybrid catalyst formulated as [MoO3(Hpto)]·H2O (2), where Hpto = 5-(2-pyridyl-1-oxide)tetrazole, was prepared by a hydrolysis–condensation reaction complex [MoO2...

Epoxidation is a reaction of carbon double bond with active oxygen, which results in the addition an oxygen atom, converting original into three-membered epoxide (oxirane) ring. Generally, raw material for making epoxy comes from petroleum. Nyamplung kernel oil non-edible that can be used as alternative derivatives. The purpose this study was to determine optimum conditions and characterization...

Transition metal complexes on polymers were found to be highly efficient in many catalysis reactions. The activity of Fe(III), Co(II), Ni(II) and Cu(II) complexes of polystyrene bound Isoxazole resin have been tested towards the epoxidation of alkenes by the decomposition of hydrogen peroxide. The reactions show a first order dependence on the concentration of both the substrates and the cataly...

A simple organocatalytic one-pot protocol for the construction of optically active allylic alcohols and amines using readily available reactants and catalyst is presented. The described reaction is enabled by an enantioselective enone epoxidation/aziridination-Wharton-reaction sequence affording two highly privileged and synthetically important classes of compounds in an easy and benign way. Th...

Here, the evolution of titanocene-catalyzed hydrosilylation epoxides that yields corresponding anti-Markovnikov alcohols is summarized. The study focuses on aspects sustainability, efficient catalyst activation, and stereoselectivity. latest variant reaction employs polymethylhydrosiloxane (PMHS), a waste product Müller–Rochow process as terminal reductant, features an activation with benzylMgB...

Benign Method for Alkene Epoxidations Benjamin S. Lane and Kevin Burgess* Department of Chemistry, Texas A & M UniVersity PO Box 30012, College Station, Texas 77842-3012 ReceiVed NoVember 17, 2000 This paper reports a simple method wherein manganese (2+) salts, for example, MnSO4, catalyze epoxidation of alkenes using 30% aqueous hydrogen peroxide as the terminal oxidant. The reactions are perf...