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Showing 1 to 20 of 259 for “"Alkenes"”.
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Metathetic Polymerisation of Cyclic Alkenes
The monometallic initiation of the ring opening polymerisation of cyclopentene as a solution in toluene or chlorobenzene has been investigated by dilatometric and calorimetric techniques using WC16or WC16/02, as the catalyst. These studies indicated the occurrence of a series of reactions between …
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Catalytic one-carbon homologation of alkenes
… and broadly applicable methods for homologating alkenes remains an unmet synthetic need. This thesis describes the development of a catalytic, one-pot method for the one-carbon homologation of alkenes. The methodology leverages the intrinsic reactivity of an allyl sulfone reagent, which undergoes …
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Lewis base catalyzed enantioselective oxysulfenylation of alkenes
… oxysulfenylation reaction for unactivated alkenes. The weak Lewis acid N-(phenylthio)-phthalimide can be activated in the presence of a moderate Brønsted acid and chiral Lewis base donors. The resulting complex is a powerful sulfenylating agent capable of sulfenium transfer to simple mono-, …
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Lewis base catalyzed enantioselective sulfenoamination of alkenes
… an enantioselective carbosulfenylation of alkenes, a seemingly contradicting phenomenon of a catalyst inhibiting a stoichiometric reaction was observed. In the absence of catalyst, the background reaction rates were comparable to or greater than the catalyzed process, despite the …
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Oxidation of Alkenes by Caldariomyces Fumago Chloroperoxidase
… the control of CPO heme N-alkylation by terminal alkenes, the epoxidation of a series of monosubstituted and 1,1-disubstituted terminal alkenes by CPO was investigated. Terminal alkenes containing a 2-methyl substituent did not inactivate CPO even when the corresponding monosubstituted alkene …
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Organoselenium redox-catalyzed, enantioselective syn-difunctionalization of alkenes
… and -catalyzed reactions of alkenes, as distinguished from other modes of organoselenium reactivity (e.g. Lewis base and peroxoselenenic acid reagents). Special attention is paid to the wealth of diastereoselective selenofunctionalization reactions with chiral, enantioenriched …
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Developing unstrained alkenes and alkynes for bioorthogonal chemistry
… have been extensively developed. Unstrained alkenes and alkynes, however, have not been well investigated as IEDDA handles. In general, unstrained dienophiles are more straightforward to synthesise compared with strained dienophiles, therefore they are more accessible to researchers. In …
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Metal-free syn-dihydroxylation of alkenes using malonoyl peroxides
… II in the metal-free syn-dihydroxylation of alkenes I. Chapter 1 outlines the available metal-free methods for achieving syn-1,2- dioxygenation of alkenes. The use of hypervalent iodine, selenium, sulfur and peroxide reagents are discussed in terms of the advantages and limitations of each …
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SOURCES AND STRUCTURES OF COMMONLY OCCURRING HIGHLY BRANCHED ISOPRENOID ALKENES
Highly branched isoprenoid (HBI) alkenes are ubiquitous lipids which have been identified in numerous geochemical samples, ranging from recent sediments to ancient oils. At the outset of the current investigation, the diatomaceous algae Haslea ostrearia (C25 alkenes) and Rhizosolenia setigera (C25 …
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Aromatization of alkenes by gallium/H-ZSM-5 zeolite catalysts
… in that it has a surplus of long chain linear alkenes with carbon numbers in the range C6-C8 . There could be large economic incentives to convert these alkenes into more valuable products, like alcohols or aromatics. Thus the purpose of this project was to determine if gallium/H-ZSM-5 …
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STRUCTURAL CHARACTERISATION OF HIGHLY BRANCHED ISOPRENOID ALKENES FROM SEDIMENTS AND ALGAE
… fourteen C25 highly branched isoprenoid (HBI) alkenes have been previously reported in estuarine and coastal sediments from locations worldwide. The parent alkane structure has been proven but only a few of the double bond positions established previously. A wide body of evidence suggests that …
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The integrated production of alkenes and oligomers from sustainable starting materials
Abstract and full text unavailable. Restricted access until 01.03.2030. Please refer to PDF.
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Reactions of the Unsaturated Cluster Dihydridodecacarbonyl Triosmium Withlewis Bases and Alkenes
Made available in DSpace on 2014-12-13T20:10:22Z (GMT). No. of bitstreams: 1 7811256.pdf: 4782213 bytes, checksum: 0c6706dfbd78902e282657550fc39aac (MD5) Previous issue date: 1978
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Chloro-arylation of Alkenes via Cooperative Photoredox and Atom-transfer Catalysis
… radical mediated chloro-arylation reaction of alkenes. The goal was to obtain alkyl chlorides with high structural diversity from readily available alkenes and diaryliodonium salts. The developed transformation benefits from a high degree of modularity through the independent functionalization …
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Thermochemistry and bond energies of nitro -alkanes, -alkenes, -carbonyls and corresponding nitrites
… were performed on a series of nitro -alkanes, -alkenes, carbonyl and corresponding nitrites representing large-scale primary, secondary and tertiary nitro compounds and their radicals resulting from the loss of skeletal hydrogen atoms. Geometries, vibration frequencies and thermochemical …
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Electron Spin Resonance Studies of the Addition of Nitrogen Dioxide to Alkenes
The addition of solutions of nitrogen dioxide to alkenes has been studied under various reaction conditions. Solutions of low concentration of nitrogen dioxide react with alkyl-substituted alkenes to produce dialkyl nitroxides, and react with a, β-unsaturated carbonyl compounds to produce iminoxy …
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Dioxirane-mediated epoxidation of alkenes: The development of catalytic and asymmetric protocols
… 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 epoxidation …
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Intramolecular [4 + 2] cycloadditions of conjugated enynes with highly strained cyclic alkenes
Seven- and eight-membered carbocycles are key features in numerous naturally occurring organic substances, many of which are biologically important natural products. This thesis describes studies directed towards the development of a [4 + 3] annulation strategy for the synthesis of seven-membered …
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