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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 23 for “"unsaturated hydrocarbons"”.
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Solubility and spectroscopy of unsaturated hydrocarbons in cryogenic solvents.
… active hydrological cycle alike, with condensed hydrocarbons instead. Although identification of chemical species is hard, many organic molecules have been detected in the atmosphere, and in icy form on the surface. Spectroscopic properties and solubility of many unsaturated hydrocarbons …
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Reactions of Hindered Phenols with Unsaturated Hydrocarbons in the Presence of Free Radicals
The reaction of hindered phenolic antioxidants , notably 2 ,6- -ditert-butyl-4-methyl-phenol (TBC) and 3,5-ditert-butyl-4-hydroxy-benzyl mercaptan (BHEM) with rubber has been investigated and the percentage of antioxidant bound under optimum conditions has been determined. The byproducts formed …
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The application of novel multinuclear catalysts derived from dendrimeric ligands in the polymerization and oligomerization of unsaturated hydrocarbons
G1 and G2 dendrimeric salicylaldimine ligands containing both substituted and unsubstituted aryl rings were synthesized via a Schiff base condensation of the appropriate salicylaldehyde and the peripheral amino groups of the corresponding G1 and G2 polypropyleneimine dendrimers. The new ligands …
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Cavity ring down and thermal lens techniques applied to vibrational spectroscopy of gases and liquids.
… specific goal is to quantify the solubility of unsaturated hydrocarbons in liquid ethane and methane. However, it is rather complicated to do so because of the low temperatures, low solubility and solvent effects. So, it is wise to do the experiments at higher temperature and test the …
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ACTIVATION OF AMMONIA, SECONDARY, AND TERTIARY AMINES BY GROUP IIA AND FIRST ROW MIDDLE AND LATE TRANSITION METAL ATOMS AND CLUSTERS
… of the cocondensates yields saturated and unsaturated hydrocarbons, and in some cases, hydrogen is formed. The reaction of certain cocondensates with unsaturated compounds yields hydrogenated products.
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A Radical Approach to Photochemical Transformations Using Earth-Abundant Metals
… transformations including functionalization of unsaturated hydrocarbons and intermolecular C-H functionalization. Most importantly, a great synthetic advantage of this reaction manifold is that these processes are found in many early transition-metal (3d metals), which are significantly more …
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Interfacial Reaction of an Olefin-Terminated Self-Assembled Monolayer Exposed to Nitrogen Dioxide: An Investigation Into the Reaction Rate and Mechanism
Reactions of strongly oxidizing pollutants with unsaturated hydrocarbon surfaces are important to many areas of scientific interest. For example, reactions of unsaturated hydrocarbons on the surface of tropospheric aerosols could have a great effect on the oxidizing capacity of the troposphere …
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Design and Development of New Catalytic Carbon-Carbon Bond Forming Reactions: I. N-Heterocyclic Carbene Based Catalytic Platform for Hauser-Kraus Annulations II. Copper-Catalyzed Selective Allylic Alkylation of Allylic Systems Using Grignard Reagents
… of functionalized olefin products from simple unsaturated systems will be described. Unsaturated hydrocarbons are usually low-cost and highly abundant chemical species, making them attractive target substrates for their transformation into synthetically valuable products. However, they pose …
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Atmospheric photochemistry, surface features, and potential biosignature gases of terrestrial exoplanets
… and carbon-rich atmosphere leads to formation of unsaturated hydrocarbons (C2H2 and C2H4). These results imply that chemical stability has to be taken into account when interpreting the spectrum of a super Earth/mini Neptune like GJ 1214b. Another intriguing category of terrestrial exoplanets is …
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Systematic improvement and applications of density functional theory in complex chemical systems
… strong correlation errors. Applying MPE to unsaturated hydrocarbons in the Pariser-Parr-Pople lattice model, we find that it deals very well with dispersion interactions. Afterwards, we describe our efforts to implement MPE for molecular systems. A new density decomposition method, …
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Role of adsorption in catalysis: applications of NMR relaxometry
… was performed with a series of C5 and C6 unsaturated hydrocarbons on two different alumina supports, γ- and θ-Al2O3. The developed techniques were applied in the study of liquid phase selective hydrogenation of citral on 5% Pt/SiO2. Infrared (IR) spectroscopy, volumetric adsorption …
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Advancements in green chemistry approaches to chemical synthesis
… Predominantly, it is used to reduce unsaturated hydrocarbons and various functional groups. However, in anhydrous form, it is highly flammable when exposed to air, which makes it unsafe to use. To mitigate this issue, we have developed a non-pyrophoric version of Ra-Ni that is easier …
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Developments and applications of methods for palladium- and copper-catalyzed carbon-nitrogen bond formation
… to directly access chiral primary amines from unsaturated hydrocarbons. While the direct hydroamination of olefins requires harsh conditions, the lack of suitable nitrogen sources has limited the development of potentially more practical formal hydroamination methods for the synthesis of …
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Thermo-analytical and physico-chemical characterisation of organoclays and polymer-clay nacomposites.
… of a homologous series of saturated and unsaturated hydrocarbons, also, the dehydrocyclisation (DHC) of fragmented alkyl chains was shown to lead to the production of various ring compounds which included substituted cycloalkenes, benzene and toluene.The thermal stability of various …
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