Global ETD Search
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 16 of 16 for “"Carbon-carbon double bond"”.
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Experiment, thermodynamic properties and modeling on combustion of methyl tert-butyl ether : isobutane and isobutene and thermodynamic properties of chloro alkanes and alkenes
… Rate constants for HO_2 radical addition to carbon-carbon double bond calculated at CBS q//MP2(full)/6-3 IG(d) and CBS-q//B3LYP/6-3 IG(d) levels of theory show similar trends to experimental data: HO_2 radical addition to tertiary carbon-carbon double bond (HO_2 addition at CD/C2 carbon atom …
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The Synthetic Utility of Enol Derivatives and the Directed Aryltitanation of Homoallylic and Allylic Alcohols
… aryltitanation to the proximal carbon–carbon double bond. Reactions with homoallylic alcohols result in stereospecific aryl incorporation at the terminal carbon of the double bond while the reactions with the allylic alcohol incorporate the aryl group proximal to the alcohol and …
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Reactions and properties of the isomeric dihydrothiophene 1, 1- dioxides
… α-sulfones. Structurally, I contains a carbon-carbon double bond, a sulfone group and two α-methylene groups while II only has one α-methylene group but its carbon-carbon double bond is conjugated with the sulfone group. It is of considerable interest to study the chemical reactions of …
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Oxygen Atom Transfer Reactions Catalyzed by Molybdenum and Tungsten Oxo Transferase Mimics
… instead of forming epoxides, the reaction led to carbon-carbon double bond cleavage in aryl-substituted alkenes. Computational studies suggest that O₂ transfer from a molybdenum oxo/peroxo intermediate facilitates the formation of 1,2-dioxetane species, which subsequently decompose into …
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Fundamental Studies of Two Important Atmospheric Oxidants, Ozone and Hydroxyl Radical, Reacting with Model Organic Surfaces
… ozone oxidation studies for the cleavage of a carbon-carbon double bond. Unfortunately the products could not be used to distinguish between probable reaction mechanisms. Hydroxyl radicals (•OH) play a major role processing atmospheric hydrocarbons. Due to their short lifetimes, not much is …
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Relationships between polymer additive molecular structure and intumescent flame retardant behaviour.
… investigated. Derivatives of PEPA containing a carbon-carbon double bond were investigated for their potential to polymerise and thus form more stable additives. Only one such polymer was successfully synthesised, that being poly (PEPA methacrylate). Despite being non-intumescent, due to its …
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The synthesis of new electro-optic polymers.
… structure separated from the acrylate carbon-carbon double bond by a spacer group, which had a carboxyethyl-carboxyhexyl structure. A synthetic route was established by synthesizing a model monomer containing a 2-methylpropyl group as the alkyl group at the end of the mesogenic group. …
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Deprotonated aza-crown ligands as simple and effective alternatives to C₅Me₅ in group 3, 4, and lanthanide chemistry
… poor alkynes favour coupling and that the carbon-carbon double bond forming process is readily reversible at room temperature. The flexibility of the deprotonated diaza-crown ligand is apparent from the isolation of both cis and trans-zirconium dibenzyl complexes from the protonolysis of …
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Rotational Molding of Acrylonitrile-Butadiene-Styrene Polymers and Blends
… that these effects are due to degradation of the carbon-carbon double bond in the butadiene, through attack by either oxygen or heat. Previous efforts have shown some success in addressing these issues. However, additional improvements are necessary to make ABS resins commercially viable to …
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Ionisation studies of chlorinated and fluorinated compounds
… be formed by extensive rearrangement across the carbon-carbon double bond. Mechanisms are suggested involving bridged trigonal intermediates to explain the production of the different channels. Studies have been performed on several perfluorocarbons, CHF\(_3\), \(c\)-C\(_4\)F\(_8\) and …
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Synthesis of o-isotoluenes, o-quinodimethanes, and benzoenynyl carbodiimides and their cyclizations to polycyclic and heterocyclic compounds
… capture the o-quinodimethane intermediate with a carbon--carbon double bond intramolecularly afforded a tricyclic phenol in low yield (6%). A number of other o-quinodimethanes were also generated by using different combinations of organoboranes and 1-lithio-1-alkynes.;6H-Indolo[2,3-b]quinolines …
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In vitro and in vivo studies on the biotransformation of β-nicotyrine, a minor tobacco alkaloid
… This intermediate then undergoes a carbon-carbon double bond reduction to yield the final product. This proposal is supported by in vivo studies on 5-hydroxy-1-methyl-5-(3-pyridyl)-3-pyrrolin-2-one which undergoes reduction to 5'-hydroxycotinine. Furthermore, 2-acetoxy-1-methyl-5- …
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Nitrate Radical-Mediated Oxidative Cleavage of Olefins Using TiO2 Photocatalysis
… Their versatility stems from their reactive carbon-carbon double bonds, which facilitate numerous chemical transformations. Among these, oxidative cleavage has emerged as a critical process, enabling the conversion of olefins into high-value carbonyl compounds such as aldehydes and ketones. …
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Biochemical and structural characterization of radical SAM enzymes Elp3 and viperin
… Trichoderma virens (fungi) and human adds to the carbon-carbon double bond of isopentenyl pyrophosphate (IPP) in vitro, resulting in the formation of a new compound 4-adenosyl isopentenyl pyrophosphate (AIPP). The crystal structure of the Trichoderma virens viperin revealed that the enzyme forms a …