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.
Results
Showing 1 to 20 of 27 for “"homolytic"”.
-
Anchimerically Assisted Homolytic Bond Cleavage
Made available in DSpace on 2014-12-05T19:37:44Z (GMT). No. of bitstreams: 1 6104257.pdf: 9136630 bytes, checksum: ec6059f438cb384b3dcc9942728411ce (MD5) Previous issue date: 1961
-
The Stereochemistry of Homolytic and Electrophilic Displacements on The Cyclopropane Ring
Made available in DSpace on 2014-12-05T19:37:25Z (GMT). No. of bitstreams: 1 6001675.pdf: 5258263 bytes, checksum: 84b95a1d6bd796b6db9a1f483cc0a542 (MD5) Previous issue date: 1960
-
Studies of Reaction Mechanisms Requiring Low Molecular Weight Thiol Cofactors
… that this reaction is a thiyl radical promoted homolytic cleavage of the cobalt-carbon bond rather than the nucleophilic attack by thiolate anion which has been pro
-
A Radical Approach to Syntheses and Mechanisms
… synthetic feasibility of intramolecular homolytic substitution at selenium for preparation of selenocycles, we set out to determine what factors influence cyclization kinetics. A series of photochemically labile Barton and Kim esters have been syntheisized and employed as radical …
-
Transformation of biomass to value-added chemicals through non-thermal plasma
… of the NTP pretreated cellulose showed that homolytic cleavage of glycosidic bonds occur during the NTP treatment. The resulting free radicals with relative long lifetime were trapped within the cellulose structure, allowing subsequent pyrolysis of the NTP-pretreated cellulose to proceed …
-
Biologically-Inspired Bimetallic Complexes for the Activation of Small Molecules
… 3(PCy3)2, the first example of the homolytic activation of dihydrogen by a synthetic Fe-only hydrogenase model. The protonation of the terminal hydride ligand of Ru2(S2C3H 6)(mu-H)(H)(CO)3(PCy3)2 has the potential to produce the first synthetic model of the Fe-only hydrogenase enzyme …
-
Investigations into cyclopropanation and ethylene polymerization via salicylaldiminato copper (II) complexes
… very unlikely. Copper-carbon bonds decompose by homolytic cleavage or C-H activation. Copper-alkyls and –aryls readily decompose into brown colored oils and salts with different colors. Ligand transfer to trimethylaluminum (TMA) appears to explain low yield ethylene polymerization.
-
Electrochemistry and photochemistry of sulphonium salts
… bromide affords products resulting from both homolytic and heterolytic cleavage of the benzyl carbon-sulphur bond. The photolysis of some xylylenebis (dialkylsulphonium bromide) salts has been investigated. This is the first report of the photolysis of bis-sulphonium salts. The photolysis of …
-
Towards Water-Soluble Peroxyl Radial Clocks
Peroxyesters undergo homolytic O-O bond cleavage under thermal and photolytic conditions, forming an alkoxyl and acyloxyl radical, the latter of which rapidly decarboxylates to form a carbon centered radical. While peroxyesters are generally decomposed under anaerobic conditions to serve as sources …
-
Crystallization studies of 5'-deoxyadenosyl radical enzymes
… the 5'-deoxyadenosyl radical is generated by homolytic cleavage of the carbon-cobalt bond of adenosylcobalamin. In the case of S-adenosylmethionine-dependent radical enzymes, the 5'-deoxyadenosyl radical is generated by reductive cleavage of the S-adenosylmethionine following injection of an …
-
Elucidation of the Various Mechanisms of Antioxidant Activity of Organosulfur Compounds
… peroxyl radicals via a concerted bimolecular homolytic substitution reaction, forming a perthiyl radical as product. In Chapter 3, inspired by the findings at 37 °C, we investigated the RTA activity of polysulfides at elevated temperatures, from 100 °C to 160 °C, and found that tetrasulfides …
-
Advanced Spectroscopic Methods for Photochemical and Electrochemical Systems
… calculations to map the process of photo-induced homolytic I-N bond dissociation and subsequent radical reaction.
-
Stabilisation of diazo compounds used in lithographic systems.
… for photolytic reaction compared to a homolytic mechanism for thermolysis.
-
Local Correlation: Implementation and Application to Molecular Response Properties
… the size of these discontinuities for the homolytic bond cleavage of fluoromethane and the heterolytic bond dissociation of singlet ketene and propadienone. Properties such as polarizabilities and optical rotation are realized through linear response theory, where the Hamiltonian is subject …
-
Theoretical exploration of char formation during lignin pyrolysis
… functionalities exhibit high resistance to homolytic cleavage and are more thermally stable.<br/><br/>In Chapter 3, we propose a reaction mechanism for the formation of aromatic char clusters from the products of lignin decomposition. Here, through investigation of sixteen parallel pathways, …
-
Investigation of a novel intein-based Escherichia coli expression system for human methylmalonyl CoA mutase : a thesis presented to Massey University in partial fulfilment of the requirements for the degree of Master of Science in Biochemistry
… (AdoCbl). The mechanism of catalysis involves homolytic cleavage of AdoCbl's unusual C-Co bond, to generate radicals. Dysfunctional hMCM results in the rare, potentially fatal metabolic disorder methylmalonic acidemia. An experimentally determined structure of hMCM would add to the …
-
Computational Studies of Selected Ruthenium Catalysis Reactions.
… indicate a significant decrease in the Ru-CH3 homolytic bond dissociation enthalpy for the oxidation of TpRu(CO)(NCMe)(Me) to its RuIII cation through both reactant destabilization and product stabilization. This oxidation can thus lead to the olefin polymerization observed by Gunnoe and …
-
Generation of Alkyl Radicals Via C-H Functionalization and Halogen Atom Transfer Processes
… way to form such alkyl radicals is the direct homolytic cleavage of C-X bonds. In past decades, photoredox catalysis has emerged as a powerful and greener tool for the synthesis of radicals under mild reaction conditions, which has brought tremendous attention. Although remarkable success has …
-
Thermal Decomposition Mechanisms of Per- and Polyfluoroalkyl Substances and Application to Analysis of Total Organofluorine
… bonds through transition states, direct homolytic cleavage, radical reactions, hydrolysis, and oxidation. Mineralization tends to occur above 700 °C in oxidizing atmospheres and at lower temperatures in inert atmospheres, volatile organofluorine is formed. However, the thermal …
-
The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis
… and substrate structure was observed for these homolytic reactions. However, by closely examining the Arrhenius parameters for hydrogen abstraction, a pattern was revealed. For substrates with C-H bond dissociation energy (BDE) > 92 kcal/mole, activation energy increases with increasing BDE (as …
Page 1 of 2