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Showing 1 to 20 of 46 for “"Furans"”.
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Computational thermochemistry of hydrocarbons, oxygenates, cyclic alkanes, and furans
… rate constants. High-energy substituted furans created from sustainable biomass sources are of interest in biofuel production due to their high-energy density, and physical properties which are comparable to modern fuel blends. Methoxyfurans show strong furan ring C---H BDEs of 120 kcal …
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Synthesis of polycyclic furans via the generation and rearrangement of strained heterocyclic allenes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1998.
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Application of Pd Catalyzed Alkylation: Synthesis of Bicyclic Furans, Isoxazolines and New Cyclopentane Amino acid Analogs
… to synthesize new heterocycles including furans, isoxazolines and new cyclopentane amino-acid analogs in an enantioselective manner. The stereochemical outcome of these reactions is influenced by desymmetrization catalyzed by hydrolytic enzymes namely lipases. Chapter 1 reviews the recent …
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Utilization of Biomass Derived Furans in Value-Added Organics and Heterogeneous Oxorhenium Catalysts for Deoxydehydration of Diols
<p>As fossil fuels are depleted, there is a growing focus on renewable chemicals based on biomass materials, including both fuels and chemical feedstocks. Current methods for biomass utilization include biological conversion to produce ethanol and various thermochemical routes (gasification, …
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Field and Greenhouse Studies of Phytoremediation with California Native Plants for Soil Contaminated with Petroleum Hydrocarbons, PAHs, PCBs, Chlorinated Dioxins/Furans, and Heavy Metals
… biphenyls (PCBs), chlorinated dioxins/furans, and heavy metals. This screening was followed by controlled greenhouse experiments to further evaluate the phytoremediation potential of the best candidates. Field specimens and soils used for this study were collected from the former Energy …
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Characterization and Chemical Kinetic Analysis of the Ignition of Representative Conventional and Bio-Derived Fuels
… especially in the transportation sector. Furans, a class of biofuels, are considered as possible alternative fuels for SI engines. They can be produced from sugars, derived from non-food biomass sources. This thesis is a contribution to fundamental characterization of their combustion …
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THREE STUDIES OF 2-PYRIDONE PHOTOADDUCT REACTIVITY
… can also undergo photo-[4+4] reactions with furans. Cycloaddition of viii yields ix. Transannular closure of ix produces triquinane x, a model system for total synthesis of crinipellin A xi.
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Retention trends of chemical classes using CCl₄ as a carrier solvent in normal-phase HPLC
… selected compounds from eleven chemical classes (furans, thiophenes, aromatic hydrocarbons, ethers, esters, ketones, aldehydes, aromatic amines, azaarenes, alcohols and phenols) on three analytical silica-bonded phase (amino (NH₂), cyano (CN) and polar amino-cyano (PAC)) columns were investigated …
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Enantioselective synthesis of 2,2,5-Tri- and 2,2,5,5-tetrasubstituted tetrahydrofurans and synthesis of diketopiperazine containing natural products
… cycloadditions with various substituted furans in excellent yield. The cycloadducts can be stereoselectively transformed into tetrasubstituted tetrahydrofurans via ring-opening metathesis/cross-metathesis or oxidative cleavage and refunctionalization. A partial synthesis of the bioactive …
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Formation of Environmentally Persistent Free Radicals on the Surface of Iron Oxide and Interior of Montmorillonite Clay
… formation of toxic compounds such as dioxins and furans. EPFRs are known to form on metal oxide nanoparticles’ surface, including iron (III) oxide, and within cation-rich clays. Plane-wave based ab initio computational methods were used to study the mechanism of formation of EPFRs on the 0001-iron …
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Direct Brønsted acid-catalyzed functionalization of benzhydryl alcohols and 2-ethoxytetrahydrofuran using potassium trifluoroborate salts
… direct substitution to afford functionalized furans in moderate to excellent yields. A variety of alkenyl- and alkynyltrifluoroborates readily participated in this transformation.
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Bioconversion of lignocellulosic hydrolysate to acetic acid using Moorella thermoacetica
… pretreatment (total phenolics up to 3 g/L and furans up to 0.5 g/L).
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Synthesis of polycyclic heteroaromatic compounds via the intramolecular [4+2] cycloaddition of conjugated hetarenynes and alkynes
… utilizing alkynylpyrroles, -thiophenes, or -furans tethered to alkynes. The hetarenyne cycloaddition substrates are readily prepared in 2-3 steps from commercially available or known 2- or 3-halohetarenes via Sonogashira coupling followed in most cases by a Mitsunobu reaction. In the majority …
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Ab Initio Density Functional Theory Optimized Geometries of Vinyl Trialkylammonium, Vinylpyridinium and Vinyldiazonium Tetrafluoroborate Salts with Natural Bond Orbital Charge Distributions in the Gas Phase
… (2E,4E)-1,6-dioxo-2,4-dienes used to make 2,5-furans, -pyrroles, and -thiophenes. In an effort to expand the scope and synthetic utility of these valuable and versatile reagents and, more fundamentally, to understand better their electronic properties (and thus their reactivity), the first …
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Carbomagnesium mediated reactions: A versatile tool in organic synthesis.
… of the reaction. A wide-range of polysubstituted furans (232) were obtained when the reaction intermediate (144) was quenched with either dimethylformamide or benzonitrile. The use of carbon dioxide as an electrophile, provided a short (two-steps) synthesis of the Merck anti-inflammatory drug, …
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Characterization of Fava Bean Hydrolysates for Future Use in Protein Enriched Beverages
… (hexanal, nonanal), alcohols (1-octen-3-ol), and furans (2-pentylfuran). Hexanal was present in all samples, while 2-pentylfuran produced the most prominent peak, with green bean, nutty, and vegetable-like flavor
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2,3-Dihalofenoles: sustratos de partida versátiles para la síntesis de heterociclos funcionalizados regioselectivamente
… regioselectively functionalized indoles, benzo[b]furans and benzo[b]thiophenes. The directed ortho-metalation strategy in conjunction with palladium-catalyzed cross-coupling reactions have been mainly used to achieve this goal. The potential of these synthetic routes is that they allow an easy …
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