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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 20 of 41 for “"direct synthesis"”.
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Direct synthesis of pyridine and pyrimidine derivatives
I. Synthesis of Substituted Pyridine Derivatives via the Ruthenium-Catalyzed Cycloisomerization of 3-Azadienynes. The two-step conversion of various N-vinyl and N-aryl amides to the corresponding substituted pyridines and quinolines, respectively, is described. The process involves the direct …
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Direct synthesis of acetylene from carbon and hydrogen
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1958
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Direct synthesis of acetylene from carbon and hydrogen
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1957
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A Direct Synthesis Method for the Conceptual Design of Transport Aircraft
… at the conceptual design level is considered. A direct sizing algorithm that does not require iteration is developed. Such direct synthesis methods can be used as important building blocks in an aircraft optimization process. New statistical equations based on current aircraft are derived for …
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Mechanistic insights into the direct synthesis of H2O2 on transition metal catalysts
… chemistries for H2O2 production, such as the direct synthesis of H2O2 (H2 + O2 → H2O2), the most promising alternative to using anthraquinones. Unfortunately, the combustion of H2 is thermodynamically favored over direct synthesis to H2O2 on most transition metal catalysts, and so significant …
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Direct synthesis gas conversion to alcohols and hydrocarbons using a catalytic membrane reactor.
… mode, was used for the conversion of synthesis gas (H2 + CO) into mixed alcohols and hydrocarbons via the Fischer-Tropsch synthesis. Carbon monoxide conversions of 78% and 90% at near atmospheric pressure (300kPa) and 493K were recorded over cobalt and bimetallic Co-Mn membranes …
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Understanding the effects of promoters on the direct synthesis of hydrogen peroxide over supported palladium catalysts
… obtained from the chlor-alkali process. The direct synthesis of H2O2 (H2 + O2 → H2O2) is a potentially less expensive and energy-consumptive alternative to the incumbent anthraquinone autoxidation process. However, the formation of H2O by the reaction of H2 and O2 is thermodynamically favored …
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Stereoselective monoalkyl diazene synthesis for mild reductive transformations : direct synthesis of densely substituted pyridines and pyrimidines
… into monoalkyl diazenes is described. This synthesis of allylic monoalkyl diazenes offers a new strategy for asymmetric synthesis by the reduction of optically active substrates or the use of chiral catalyst systems for the reduction of racemic and prochiral substrates. Sensitive substrates …
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Chemical functionalization and modification of Au clusters
… size of the NCs remained unchanged during the synthesis and after the functionalization reaction which suggests the high stability of these particles. The functionalization of the ligand was confirmed by Proton Nuclear Magnetic Resonance Spectroscopy (1H NMR) and the NC size was characterized …
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Analysis and Design of Ultrasound Phased Arrays for Hyperthermia Cancer Therapy
… introduces a new method which will allow the direct synthesis, without scanning, of the more diffuse heating patterns useful in hyperthermia. Two quite different phased arrays are theoretically evaluated as hyperthermia applicators: a concentric ring array (CRA), and an N x N square-element …
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Total synthesis of pyranonaphthoquinone natural products
… against angina pectoris. Efforts toward the direct synthesis of these natural pyranonaphthoquinones forced us to develop new methodologies. During our research, a general methodology was developed to stereoselectively synthesize the common isochromanquinone skeleton. The key step in the …
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Synthesis and Structure of a Substituted Pyridazine
… organics as the semiconducting material. The synthesis of 5, 6-fused ring pyridazines beginning from fulvenes (Scheme 1) is described herein. These fused heterocycles will serve as synthetic models and building blocks for potential organic or organometallic conducting polymers.</p> <p>Our goal …
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Studies of 3-hydroxypyrid-4-ones and related ligands
… structure is proposed for the salts. The direct synthesis of l,2-dimethlyl-3- hydroxyprid-4-one, has also been achieved by Modifying a reported route. Two new, and general synthetic routes have been investigated in a preliminary way. One route involving the reaction of …
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Doping of Metal Organic Framework (UiO) and for N02 adsorption at ambient Conditions
… investigate the effect of metal or amine doping (direct synthesis) on the textural properties and adsorption capabilities of UiO in both moist and dry conditions. The samples were characterized before and after exposure to NO2 by X-ray diffraction, scanning electron microscopy, N2- adsorption at …
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Catalysis over molybdenum containing nitride materials
… targets. An example of this could be the direct synthesis of aniline from benzene, which would avoid the lengthy, uneconomic, and environmentally unfriendly process currently employed. This work explores the reactivity of bulk and supported transition metal nitride catalysts, with …
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Nucleic acid biosensors
… “affinity” microspheres were developed for the direct synthesis of microsphere bound nucleic acid sensors.
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1. C-C Bond Formation via Soft Enolization and Umpolung-like Chemistry 2. Electrophilic Fluorination of Organozinc Reagents
… enolization and Umpolung-like chemistry. The direct synthesis of 1,3-diketones and β-keto thioesters using in good yields and with wide substrate tolerance was possible using our soft enolization strategy using crude acyl chlorides. Another C-C bond strategy explored was an Umpolung-like …
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Alkylation of phenol with methanol over H-ZSM-5, H-Beta, H-Mordenite, H-USY and H-MCM-22
Alkylphenols are intermediates used in the synthesis of many important substances. The most significant of the commercially important lower alkylphenols are cresols (methyl phenols) and xylenols (dimethyl phenols). The main markets for alkylphenol products are nonionic detergents, phenolic resins, …
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Electrochemical fabrication of semiconductor nanostructure arrays for photonic applications
… nm. To address these challenges, a nanostructure synthesis technique has been developed that is based on the self-organization of nanometer scale pores during the anodization of aluminum thin films. This template can then be used for direct synthesis of semiconductor material, or as a pattern …
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