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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 119 for “"epoxidation"”.
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The application of organocatalytic Asymmetric Epoxidation
… Since 2005, metal-free catalytic asymmetric epoxidation using iminium salts such as 1 has been successfully employed to access chiral chromenes within the Page group. Iminium-catalysed asymmetric epoxidation methodology has been applied to the synthesis of levcromakalim, 3 trans-khellactone, …
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Gas-Phase Epoxidation of Ethylene and Propylene
Catalysts consisting of silver on α-Al₂O₃, α-SiC, and β-SiC supports were synthesized and tested for catalytic performance in the gas-phase direct oxidation of ethylene to ethylene oxide. For this study, which used no promoters, ethylene oxidation selectivity of SiC-supported catalysts ranged from …
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RECENT ADVANCES IN IMINIUM SALT CATALYSED ASYMMETRIC EPOXIDATION
… current developments in the area of asymmetric epoxidation of alkenes using chiral iminium salt catalysts. The first chapter reviews past and present developments in; catalytic asymmetric epoxidation, and covers the application of this reaction towards the kinetic resolution of racemic olefins. …
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The development and application of organocatalytic asymmetric epoxidation
… capable of excellent stereocontrol in the epoxidation of alkene substrates. In considering possible refinements to catalyst structure, we targeted two development paths: i) variation of the dihedral angle Φ within the atropos azepinium systems - shown by Lacour to strongly influence the …
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Enantioselective epoxidation catalyzed by manganese-substituted human carbonic anhydrase
… and its use as a catalyst for enantioselective epoxidation of olefins is also described.</p>
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Electrochemical Alkene Epoxidation Using Water as the Oxygen Source
Alkene epoxidation is a crucial chemical functionalization reaction that produces key chemical intermediates for the synthesis of various commercial end products. The current methods of producing epoxides are associated with a number of challenges, including the use of energy-intensive and …
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On the mechanism of titanium-tartrate catalyzed asymmetric epoxidation
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1986
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NEW GREEN TECHNOLOGIES FOR ORGANOCATALYTIC ASYMMETRIC EPOXIDATION APPLICATIONS IN SYNTHESIS
… thesis describes the application of asymmetric epoxidation reactions on chromene substrates mediated by Page’s iminium salt catalysts. Organocatalytic asymmetric epoxidation is an efficient tool to access enantiomerically rich epoxides. This study is divided into three main parts which are …
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Reaction mechanisms for catalytic partial oxidation systems : application to ethylene epoxidation
… mechanism for explaining selectivity in ethylene epoxidation. Basis of the computational methodology is the Unity Bond Index- Quadratic Exponential Potential (UBI-QEP) approach, which applies quadratic exponential potential to model interaction energies between atoms and additive pairwise energies …
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Dioxirane-mediated epoxidation of alkenes: The development of catalytic and asymmetric protocols
… general and efficient protocol for the catalytic epoxidation of alkenes has been developed. The in situ generation of reactive dioxiranes capable of epoxidizing a variety of alkenes under biphasic conditions has been accomplished using phase transfer catalysts bearing a carbonyl group. Optimal …
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LINDANE METABOLISM: EPOXIDATION OF POLYCHLOROALKENES AND EFFECTS OF ROUTE OF ADMINISTRATION ON EXCRETION.
LINDANE METABOLISM: EPOXIDATION OF POLYCHLOROALKENES AND EFFECTS OF ROUTE OF ADMINISTRATION ON EXCRETION.
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Designing new chiral hydroxamic acid ligands for the asymmetric epoxidation reaction in water
… acid ligands for the V-catalysed asymmetric epoxidation reaction in aqueous solution. During the course of this project, a wide range of allylic alcohols were epoxidised under mild reaction conditions. The target epoxides were isolated in good-to-excellent yields with up to 94% ee. To further …
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Enantioselective Epoxidation of Alkenes by Chloroperoxidase and the Development of a Chloroperoxidase Expression System
… in this report, is shown to catalyze the epoxidation reaction of a number of alkenes in a highly enantioselective manner with enantiomeric excesses between 50% and 97%. Good substrates were generally non-polar cis-alkenes of less than nine carbons in length. Unsubstituted terminal alkenes …
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Ketone -Catalyzed Epoxidation of Alkenes With Oxone and Palladium -Catalyzed Biaryl Synthesis via Silacyclobutanes
Aryl(fluoro)silacyclobutanes and aryl(chloro)silacyclobutanes have been found to undergo cross-coupling reactions with aryl iodides. The rate of reaction and extent of homocoupling were dramatically affected by the addition of ligands for the palladium catalyst. A wide range of electronically …
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Influence of solvation and microenvironment on alkene epoxidation with hydrogen peroxide within titanium silicates
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Encapsulation of Achiral Mn(Salen) Complexes Into Cytochrome C Peroxidase: Spectroscopic Characterizations and Epoxidation Studies
The powerfulness and potential of this strategy have been successfully demonstrated. Other achiral catalytic metal complexes can also be incorporated into CcP or other protein scaffolds to produce a library of biocatalysts to perform various organic transformations.
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Synthesis and characterization of rhenium (vii) and rhuthenium (ii) dendritic catalysts: oxidative cleavage and epoxidation of alkenes
… compounds C1-DC2 were then tested towards the epoxidation of selected cyclic alkenesi.e cyclohexene and cis-cyclooctene, respectively and straight chain alkenes. The catalyzed epoxidation reactions were carried out at room temperature employing using Urea hydrogen peroxide adduct (UHP) as the …
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Stereoselective reactions of 16-Methylene 19-Norsteroids
The influence of the 17-substituent upon epoxidation of 3-methoxy-16-methylene-estra- 1,3,5(10)-trien-17-one and the derived 17β-hydroxy and 17β-acetoxy compounds was investigated. Alkaline hydrogen peroxide epoxidation of 3-methoxy-16-methyleneestra- 1,3,5(10)-trien-17-one occurred in good yields, …
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