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Enantioselective Epoxidation (enantioselective + epoxidation)

Distribution by Scientific Domains
Chemistry100%
Distribution within Chemistry
Organic Chemistry76%
General & Introductory Chemistry23%

Selected Abstracts

Highly Enantioselective Epoxidation of Unfunctionalized Olefins Catalyzed by Chiral Jacobsen's Catalyst Immobilized on Phenoxy-Modified Zirconium Poly(syrene-phenylvinylphos- phonate)phosphate

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2010
Xiaochuan Zou
Abstract Chiral Jacobsen's catalyst was axially immobilized onto phenoxy-modified zirconium poly(styrene-phenylvinylphosphonate)phosphate (ZPS-PVPA). The immobilized catalysts show comparable ee values for asymmetric epoxidation of styrene and much higher ee values for ,-methylstyrene (73.7% vs. 54.0%) and indene (99.9% vs. 65.0%) than the homogeneous Jacobsen's catalyst. Moreover, the as-synthesized catalysts are relatively stable and can be recycled at least five times without significant loss of activity and enantioselectivity. A point worth emphasizing is that the heterogeneous catalysts afforded remarkable increases of conversion and ee values in the absence of expensive O-coordinating axial bases for the asymmetric epoxidation of olefins, especially for the epoxidation of ,-methylstyrene (conversion: from 24.3% to 99.9%; ee: from 29.4% to 73.7%), which may overcome the last obstacle for the potential industry application of chiral Jacobsen's catalyst. [source]

Highly Enantioselective Epoxidation of Styrenes Catalyzed by Proline-Derived C1 -Symmetric Titanium(Salan) Complexes,

ANGEWANDTE CHEMIE, Issue 40 2009
Kazuhiro Matsumoto Dr.
Titanhart! Mit neuartigen, von Prolin abgeleiteten C1 -symmetrischen Titan(salan)-Komplexen gelingt die Epoxidierung von Styrolderivaten mit wässrigem Wasserstoffperoxid als Oxidationsmittel mit Enantiomerenüberschüssen zwischen 96 und 98,% (siehe Schema). [source]

ChemInform Abstract: Asymmetric Counteranion-Directed Transition-Metal Catalysis: Enantioselective Epoxidation of Alkenes with Manganese(III) Salen Phosphate Complexes.

CHEMINFORM, Issue 19 2010
Saihu Liao
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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. [source]

ChemInform Abstract: Enantioselective Epoxidation of Nonconjugated cis-Olefins by Chiral Dioxirane.

CHEMINFORM, Issue 14 2010
Christopher P. Burke
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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. [source]

ChemInform Abstract: Immobilization of Chiral Quininium Salt in Ionic Liquid for Enantioselective Epoxidation of Chalcones.

CHEMINFORM, Issue 47 2009
Ravindra R. Pal
Abstract ChemInform 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. [source]

ChemInform Abstract: Self-Supported BINOL-Zn Catalysts for Heterogeneous Enantioselective Epoxidation of (E)-,,,-Unsaturated Ketones.

CHEMINFORM, Issue 34 2009
Haiming Wang
Abstract ChemInform 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. [source]

ChemInform Abstract: Enantioselective Epoxidation of ,,,-Enones Promoted by (1R,3S,4S)-2-Azanorbornyl-3-methanol as an Organocatalyst.

CHEMINFORM, Issue 3 2009
Jun Lu
Abstract ChemInform 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. [source]

A New Chiral Diiron Catalyst for Enantioselective Epoxidation.

CHEMINFORM, Issue 29 2007
Caroline Marchi-Delapierre
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

Enantioselective Epoxidation of ,,,-Enones by Electrophilic Activation with a BINOL,Zinc Catalyst.

CHEMINFORM, Issue 19 2006
Ana Minatti
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

ChemInform Abstract: Enantioselective Epoxidation of Chromenes Using Chiral Mn(III) Salen Catalysts with Built-in Phase-Transfer Capability.

CHEMINFORM, Issue 28 2002
Rukhsana I. Kureshy
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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. [source]

ChemInform Abstract: Enantioselective Epoxidation of Non-Functionalized Alkenes Using an Urea,Hydrogen Peroxide Oxidant and a Dimeric Homochiral Mn(III)-Schiff Base Complex Catalyst.

CHEMINFORM, Issue 30 2001
Rukhsana I. Kureshy
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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. [source]

Enantioselective Epoxidation of Terminal Alkenes to (R)- and (S)-Epoxides by Engineered Cytochromes P450 BM-3

CHEMISTRY - A EUROPEAN JOURNAL, Issue 4 2006
Takafumi Kubo
Abstract Cytochrome P450 BM-3 from Bacillus megaterium was engineered for enantioselective epoxidation of simple terminal alkenes. Screening saturation mutagenesis libraries, in which mutations were introduced in the active site of an engineered P450, followed by recombination of beneficial mutations generated two P450 BM-3 variants that convert a range of terminal alkenes to either (R) - or (S) - epoxide (up to 83,% ee) with high catalytic turnovers (up to 1370) and high epoxidation selectivities (up to 95,%). A biocatalytic system using E. coli lysates containing P450 variants as the epoxidation catalysts and in vitro NADPH regeneration by the alcohol dehydrogenase from Thermoanaerobium brockii generates each of the epoxide enantiomers, without additional cofactor. [source]