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Showing 1 to 20 of 164 for “"Carbon-nitrogen"”.
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Biocatalytic carbon nitrogen double bond reduction
… enoate reductase family (EC 1.3.1.31) and the carbonyl reductase family (EC: 1.1.1.1). The decision of targeting these enzyme classes has been based on the existing literature and on substrate analogy for the enoate reductases and based on in silico docking for the carbonyl reductase. As a …
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New carbon-nitrogen bond-forming reactions of palladium
… of an unactivated alkene into a palladium-nitrogen bond and the reductive elimination of an alkylamine from a low-valent alkylpalladium amido complex. These reactions were previously proposed as steps in palladium catalyzed reactions, however, these are the first examples of isolated …
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Advances in palladium-catalyzed carbon-nitrogen bond forming processes
Chapter 1. Microwave-assisted, palladium-catalyzed C-N bond-forming reactions with aryl/heteroaryl nonaflates/halides and amines using the soluble amine bases DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) or MTBD (7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene) and a catalyst system consisting of Pd2dba3 …
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Boron-carbon-nitrogen heterocycles for hydrogen storage: Synthesis and characterizations
… current development of ammonia borane and boron-carbon-nitrogen containing molecules, especially from the perspective of hydrogen storage application. Existing challenges are put forward at the end of this chapter. Chapter 2 gives an overview of the instruments and technologies applied in my PhD …
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Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests
Carbon (C), nitrogen (N), and calcium (Ca) cycling in forest ecosystems is controlled largely by the recycling of organic matter by biota and by the balance of new inputs and losses. In the northeastern U.S., the availability of these elements has been dramatically altered by human activities. Acid …
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Mechanistic studies on palladium-catalyzed carbon-nitrogen bond forming reactions
Precatalyst species present in a solution of Pd₂(dba)₃ and Xantphos were identified as Pd(Xantphos)(dba) and Pd(Xantphos)₂ by use of ³¹p NMR and independent syntheses. Pd(Xantphos)₂ was found to form at high ligand concentrations. To determine whether the formation of this species affected reaction …
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Mechanistic studies on metal-catalyzed carbon-nitrogen bond forming reactions
Mechanistic studies on copper and palladium-catalyzed C-N bond forming reactions are described. To understand the mechanistic details of these processes, several principles of physical organic chemistry have been employed. Chapter 1. We have investigated the mechanism of the copper-catalyzed …
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HYPERVALENT IODINE METHODS FOR CARBON–NITROGEN AND CARBON–CARBON BOND FORMATION
Carbon-carbon and carbon-nitrogen bond forming events are essential in chemistry. Although numerous stoichiometric/catalytic methods provided elegant and powerful solutions enabling those processes, the use of scarce/toxic reagents and harsh conditions is still ubiquitous in this field. As a …
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Development and application of palladium-catalyzed carbon-nitrogen bond forming reactions
… of this reaction to the amination of various nitrogen containing halogenated heterocycles is discussed. Chapter 3. A Palladium-Catalyzed Method for the Preparation of lndoles via the Fischer lndole Synthesis. A Pd-catalyzed method for the preparation of N-aryl benzophenone hydrazones is …
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The influences of carbon, nitrogen, and argon on aluminum oxynitride spinel formation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Synthesis and Applications of Boron-Carbon-Nitrogen Containing H-rich Compounds as Hydrogen Carriers
Hydrogen-rich compounds containing boron (B), nitrogen (N), and carbon (C) have attracted wide research attention for hydrogen storage. Borane-amine complexes are among the most promising candidates, but so far all the reported systems have various drawbacks. This PhD project invented a novel …
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Developments and applications of methods for palladium- and copper-catalyzed carbon-nitrogen bond formation
… and application of methodologies that enable carbon-nitrogen (C-N) bond formation catalyzed by late transition metals such as palladium and copper. The first part of this thesis focuses on the use of palladium catalysis for the construction of a carbon(sp²)-nitrogen bond in the context of a …
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Effects of Carbon, Nitrogen, Particle size and moisture on Oyster Mushroom Production in KwaZulu Natal - Cedara
… well maintained. Different potential sources of carbon and nitrogen such as wheat bran, teff, lucerne, bagasse, maize, sawdust, juncao and hominy chop were analysed using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES Analysis). Carbon and nitrogen content was used to set up …
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INTRAMOLECULAR CARBON-NITROGEN COUPLING FROM ISOLATED MONOHYDROCARBYL PALLADIUM(IV) COMPLEXES PREPARED USING H2O2 AS TERMINAL OXIDANT
Carbon-nitrogen coupling is achieved traditionally by coupling of aryl halides and amines through a Pd(0)/Pd(II) catalytic cycle (Buchwald-Hartwig amination). A newer, more atom-economical approach to the synthesis of amines is based on oxidative C-H amination. Recent studies of C-H amination …
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The catalytic hydrogenation of carbon-carbon and carbon-nitrogen multiple bonds by a cobalt(I) complex
… complexes for the catalytic hydrogenation of carbon-carbon multiple bonds can be attributed to the well-defined reactivity, stability and overall high activity of such catalytic systems. The development of sustainable, more abundant and relatively less toxic late first-row transition metal …
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Development of new transition metal-catalyzed carbon-fluorine, carbon-nitrogen, and carbon-carbon bond forming processes
Chapter 1. Palladium-Catalyzed Fluorination of Cyclic Vinyl Triflates: Dramatic Effect of TESCF₃ as an Additive A method for the synthesis of cyclic vinyl fluorides with high levels of regiochemical fidelity has been achieved by Pd-catalysis employing a new biarylphosphine ligand and TESCF₃ as a …
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Synthesis and reactivity of early transition metal complexes containing multiple metal to carbon, nitrogen, or oxygen bonds
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1982.
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Exploration of Carbon-oxygen and Carbon-nitrogen Bond Formation Utilizing Trichloroacetimidates and Investigations of New Reactions Mediated By Oxoammonium Salts
<p>Mono-O-alkylated 1,1′-bi-2-naphthols (BINOLs) are often used as the source of chirality for catalysts or ligand systems that are employed in asymmetric organic transformations. However, these BINOLs can be hard to synthesize. The O-alkylation of BINOL can be accomplished with primary and …
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Seasonal responses of carbon, nitrogen, and phosphorus cycling to woodland reduction and different organic matter additions in the semiarid Great Basin
Abstract:Disturbances that impact microbially-mediated processes of decomposition and mineralization of organic matter carry ecosystem-level consequences because soil microorganisms can immobilize nutrients or render them available for plant uptake. The stochastic nature of resource availability in …
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Childhood diet and mobility at medieval (1240s AD) Solt-Tetelhegy, Hungary as reconstructed from stable carbon, nitrogen, and oxygen isotope analysis
… AD) Hungarian site of Solt-Tételhegy. Stable carbon and nitrogen isotope analyses were conducted on dental enamel and dentin from 24 individuals to examine their childhood diet. Although previous stable isotopic research has described the diet of medieval European peoples, this is the first …
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