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Showing 1 to 16 of 16 for “"Reduction (Chemistry)"”.
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Regioselective Synthesis of Glycosaminoglycan Analogs
… these GAG analogs, we applied novel azide reductions by DTT and thioacetic acid that are new to polysaccharide chemistry. We systematically investigated the scope of DTT and thioacetic acid azide reduction chemistry under different conditions, substrates, and functional group tolerance. …
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Structural investigations of class la ribonucleotide reductases by electron microscopy
Ribonucleotide reductase (RNR) catalyzes the reduction of nucleotides to their 2'-deoxynucleotide counterparts. The class la RNR from Escherichia coli is composed of two homodimeric subunits [alpha]2 and [beta]2 that form an [alpha]2[beta]2 complex to perform nucleotide reduction. Chemistry is …
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The Total Synthesis of Pseudonocardia sp. Quinolone Natural Products and Studies Towards the Total Synthesis of 1β-Hydroxyalantolactone
… of a diene which was itself accessed by Birch reduction chemistry. Whilst the synthesis is as yet incomplete, access was granted to a key intermediate encompassing around half of the stereocentres present in the natural product.
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Halogen-elimination photochemistry and oxygen-activation chemistry of late transition-metal complexes
Multi-electron reaction chemistry, from both ground- and excited-state species, is at the heart of many topics in renewable energy and catalysis. In this thesis, two classes of reactions central to the themes of energy conversion and multi-electron chemistry are studied on mono- and bimetallic late …
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Probing of reaction mechanisms, and development of polymeric materials for lithium-air batteries
… between the electrolyte/electrode with oxygen reduction products, and high charging over-potentials that lead to poor cycle life. We address these challenges by developing non-flammable polymeric-based electrolytes and electrodes, and investigate their performance and stability in Li-O₂ …
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New chelating ligands: Applications to hydrodenitrogenation catalysis
… (X = Me (25), X = benzyl (24)). Initial reduction chemistry resulted in the formation of (BIPP)Ta(η⁶-C₆Et₆)Cl (31) through the reaction of 19 with two equivalents of Na/Hg and three equivalents of 3-hexyne. From the formation of 31 it was determined that sterics play a large role in the …
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Palladium-catalyzed PMHS reductions of imines
We explored the Pd-catalyzed reductions of imines using polymethylhydrosiloxane (PMHS) in the presence of aqueous KF. This methodology developed by our group facilitates the reduction of nitrogen-containing functional groups under mild conditions and short reactions times. To the best of our …
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Birch reduction of benzamide, m-methoxy-benzamide and terephthalic acid
… a variety of experimental procedures for Birch reduction at dry-ice temperature (-65 to -78°C), benzamide was reduced to 1,4-dihydrobenzamide: (a) By using Niem’s procedure (27), with lithium and ethanol in liquid ammonia at dry-ice temperature and where ethanol was added slowly after lithium …
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Studies of proton pumping mechanism in BA3 type cytochrome oxidase of thermus thermophilus and CBB3 type cytochrome oxidase of vibrio cholerae
… which couple the free energy liberated from the reduction of O2 to the translocation of protons across the membrane. The A-family requires two proton input channels (D- and K-channels) to transfer protons used for oxygen reduction chemistry and proton pumping, with the D-channel transporting all …
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A methodology for studying denitrification by recently formed sulfides
… donors. The most extensive studies involving the reduction ofN03- by inorganic species have focused on pyrite (FeS2) and Fe(II). Few studies have considered the possibility of denitrification by recently formed sulfide species, such as hydrogen sulfide (H2S), iron monosulfide (FeS), mackinawite …
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Study of the application of the high performance liquid chromatography-particle beam interface-mass spectrometry technique on some pesiticides and the reduction phenomena in the system
… of the work concentrated on the studies of the reduction phenomena of nitro compounds in the HPLC-PB-MS system. Direct probe mass spectrometry and gas chromatography-mass spectrometry techniques were also used in the work. Factors that have effects on the reduction of the nitro compounds were …
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Passivation of III–V Nanowires Using Dielectrics Deposited by Atomic Layer Deposition
… current could attributed to the chemical reduction and removal of the NW native oxide by reaction with the TMA precursor during the ALD process [7]. This native oxide contains electron trapping sites and enhances charge carrier scattering within the NW channel, therefore its removal could …
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A study of the Birch reduction of m-Methoxybenzamide
<p>This thesis is (1) an investigation in the identity of the unknown material Qazi (20) obtained when benzamide was reduced at the boiling point of ammonia with 3.3 equivalents of sodium and ethanol, (2) characterization of the components of the brown liquid obtained when m-methoxybenzamide was …
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The electrolytic reduction of osmium tetroxide in perchloric acid solution
This is a study involving some of the chemistry of osmium tetroxide in perchloric acid solution. The research was originally instigated from a seminar report on the ruthenium III thiocyanate complex ion which was studied in perchloric acid solution. The seminar report given by Craig Townsend …
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Synthesis of α, β-Substituted Alkenylphosphonates from α-Phosphonovinyl Triflates: I) Palladium Catalyzed Suzuki-Miyaura Cross-coupling with Aryl Boronic Acids II) Palladium Catalyzed Reduction
… Part II of this thesis describes the Pd-mediated reduction of α-phosphonovinyl triflates in the presence of formic acid as a new method to prepare β-substituted alkenylphosphonates in 64-90% yield.</p>