نتایج جستجو برای: ethylene epoxidation

تعداد نتایج: 30626  

Journal: :Chemical communications 2011
Hui Lin Yan Liu Zhong-Liu Wu

Enantiomerically enriched glycidol derivatives with contiguous stereogenic centers were obtained in a highly diastereo- and enantio-selective epoxidation catalyzed with the styrene monooxygenase StyAB2.

Journal: :Dalton transactions 2016
Ester Manrique Albert Poater Xavier Fontrodona Miquel Solà Montserrat Rodríguez Isabel Romero

Correction for 'Reusable manganese compounds containing pyrazole-based ligands for olefin epoxidation reactions' by Ester Manrique et al., Dalton Trans., 2015, 44, 17529-17543.

2017
George A. Kraus

Trideuteriated trichothecenes can be generated from diacetoxyscirpenol by a reaction sequence involving acetylation, epoxide deoxygenation, allylic oxidation, deuterium exchange, epoxidation, and reduction.

Journal: :Chemical communications 2005
Michael Chi-Yung Tang Kwok-Yin Wong Tak Hang Chan

Hydrogen peroxide can be electrosynthesized from oxygen in [bmim][BF(4)]-water and used in situ for the epoxidation of alkenes.

2008
E. Herrero

The epoxidation of limonene with hidrogen peroxide was studied over zeolite Tibeta (a large pore material) and heteropoly acids on carbono and alumina supported. PW11/C was catalyst the best tested. Introduction In the last years, the increase in environmental restrictions lead to the search for new oxydant systems to replace the traditionals in order to avoid the generation of polluting efflue...

Journal: :Green Chemistry 2021

A family of new bio-based surfactants have been prepared via the epoxidation and PEGylation lactonic sophorolipids. This modification enhances their performance diversifying potential applications.

2002
Emily A. CARTER William A. GODDARD Arthur Amos Noyes

We have examined various postulated pathways for the catalytic epoxidation of olefins by silver using ab initio quantum mechanical methods to study likely intermediates in this reaction. In particular, we predict preferred binding sites, geometries, vibrational frequencies, and binding energies for 0, O,, Cl, H, OH, and C,H, on a cluster model for Ag aggregates present on supported catalysts. T...

Journal: :Inorganic chemistry 2006
Ned A Stephenson Alexis T Bell

In a previous study, the authors showed that iron(III) [tetrakis(pentafluorophenyl)]porphyrin chloride [(F20TPP)FeCl] is catalytically inactive for cyclooctene epoxidation by hydrogen peroxide in acetonitrile but is catalytically active if the solvent contains methanol. It was suggested that the precursor to the active species is (F20TPP)Fe(OCH3) in methanol-containing solvents. The present stu...

2017
Fei Ding Meiling Wang Bin Liu Shuoxin Zhang

Melatonin plays an important role in tolerance to multiple stresses in plants. Recent studies have shown that melatonin relieves photoinhibition in plants under cold stress; however, the mechanisms are not fully understood. Non-photochemical quenching (NPQ) is a key process thermally dissipating excess light energy that plants employ as a protective mechanism to prevent the over reduction of ph...

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