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Showing 1 to 20 of 28 for “"Valerolactone"”.
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An Examination of γ-valerolactone Ring Opening and Decarboxylation in Multiphase System and Over Various Solid Acid Catalysts
… carbon source for industrial applications. γ-valerolactone (GVL) is an example of biomass-derived platform chemicals that provides multiple commercial potentials. Of interest here is the acid-catalyzed ring opening of GVL to form pentenoic acid (PEA) isomers and following decarboxylation to …
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An Examination Of Γ-valerolactone Ring Opening And Decarboxylation In Multiphase System And Over Various Solid Acid Catalysts
… carbon source for industrial applications. γ-valerolactone (GVL) is an example of biomass-derived platform chemicals that provides multiple commercial potentials. Of interest here is the acid-catalyzed ring opening of GVL to form pentenoic acid (PEA) isomers and following decarboxylation to …
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Crystallization and Melting Studies of Poly(ε-caprolactone) and Poly(ethylene oxide) using Flash™ Differential Scanning Calorimetry and Preparation and Characterization of Poly(δ-valerolactone) Fractions
… heterogenous primary nucleation range. Poly(δ-valerolactone) was synthesized using microwave-assisted techniques. Narrow molecular weight fractions were obtained using successive precipitation fractionation. Preliminary isothermal crystallization studies suggest that conventional thermal …
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Production of Bio-based Lactone Monomers for Intrinsically Recyclable Plastics
… pathway for the production of α-cyclohexyl-δ-valerolactone (CVL) starting from formaldehyde and δ-valerolactone (DVL). We developed a continuous gas-phase reactor using alkaline earth oxides supported on silica as catalysts for an aldol condensation reaction. CaO and BaO showed 90% and 83% …
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The synthesis of biodegradable polymers using aluminium alkoxide initiators
… opening polymerisation of ε-caprolactone and δ-valerolactone. The effect of the reaction solvent on the kinetics of the polymerisation of ε-caprolactone has been studied. The rate of polymerisation was found to be faster in solvents of lower polarity and donor nature such as toluene. In general …
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Photooxidation Reactions of Small-Chain Methyl Esters, Aerosol Photoelectron Spectroscopy, and the Photodissociation of Ethylenediamine
… photoelectron spectroscopy of isoprene and gamma-valerolactone, and the TPEPICO investigation of ethylenediamine. Experiments were conducted at the Lawrence Berkeley National Lab Advanced Light Source (ALS), the National Synchrotron Radiation Research Center in Hsinchu City (NSRRC), and the …
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Properties of Absorbent Polymer Extractants for the Selective Removal of Target Molecules from Fermentation Systems
… extraction of a hydrophilic target molecule, 4-valerolactone, produced by recombinant Pseudomonas putida KT2440, featuring an equilibrium-limited final step. The aim was to demonstrate the first application of equilibrium-pulling using selective product absorption, improving production by 30%. …
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Effective Optimization of Catalytic Hydrogenations Using a Rationally Designed Hydrogen Uptake System
… using the reduction of levulinic acid to γ-valerolactone. Accurate information pertaining to the quantity of hydrogen consumed was obtained in addition to in situ differential rates reaction allowing for the derivation of the integrated rate law. Subsequently, the newly designed uptake …
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Synthesis of furanosesquiterpenoid natural products
… cyclisation to generate an a-methylene-6-valerolactone ring system have been prepared.
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Hidrogenação de ácido levulínico a gama-valerolactona empregando fosfetos de metais de transição suportados em sílica
… evaluated for levulinic acid hydrogenation to γ- valerolactone: Ni2P, CoP, MoP, WP and Fe2P. The catalysts were prepared in two steps: phosphate synthesis by incipient wetness followed by calcination, and phosphide synthesis by in situ temperature programmed reduction. The samples were …
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Development of metabolic pathways for the biosynthesis of hydroxyacids and lactones
… (3HV) 5.3 g/L 4-Hydroxyvalerate (4HV) 27.1 g/L 4-Valerolactone (4VL) 8.2 g/L 3,4-Dihydroxybutyrate (DHBA) 3.2 g/L 3-Hydroxybutyrolactone (3-HBL) 2.2 g/L The production of the two hydroxyvalerates was accomplished through the reduction of the renewable substrate levulinate in Pseudomonas putida by …
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Promotion of Heterogeneous Acid and Base Catalysts for Biomass Upgrading
… catalytic synthesis of the α-methylene-δ-valerolactone (MVL), the monomer of the chemically recyclable acrylic plastic poly-MVL, via a gas-phase aldol condensation of δ-valerolactone (DVL) and formaldehyde (FA). In particular, CaO supported on SiO₂ catalyzed the reaction with >95% …
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Photoionization Mass Spectrometry and Photoelectron-Photoion Coincidence (PEPICO) Spectroscopy Studies of Select Biofuel Molecules
… photoionization mass spectrometry studies on γ-valerolactone (GVL). The photoionization cross section of GVL and some suspected combustion products are measured. In addition, several dissociative ions are determined. Theoretical calculations are used to support all alignments. This data is vital …
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Synthesis of Amphibian Alkaloids and Development of Acetaminophen Analogues
… The regioselective ring opening of lactones (δ-valerolactone and γ-butyrolactone) with aryllithium reagents is reported for the construction of a series of δ-hydroxyarylketones and γ-hydroxyarylketones. Both the R and S enantiomers of the amphibian alkaloid noranabasamine were prepared in >30% …
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Kinetics of ketone hydrogenation over supported Ru catalysts
<p>A kinetic investigation of the production of y-valerolactone (GVL) via the aqueous phase hydrogenation of levulinic acid (LA) over supported Ru catalysts was carried out, in order to understand how to better design a hydrogenation catalyst for such biomass catalytic strategies. At temperatures …
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Halo Enol Lactones as Enzyme-Activated Irreversible Inhibitors of Chymotrypsin: Their Synthesis, Kinetics, and Mechanism of Inactivation (Suicide Substrates)
… were prepared differing in ring size (6-membered valerolactones and 5-membered butyrolactones), and in the nature of the aromatic substituent (phenyl and naphthyl) and the halogen. The kinetic parameters for the inactivation process were determined for each inhibitor and it was found that the …
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Ionic Liquids in the Chemical Valorisation of Pulps and in their Chemical Analyses
… with dimethyl sulfoxide (DMSO) or gamma valerolactone (GVL) as co-solvents. All of the ILs utilised in this work were synthesised in our laboratory via Menshutkin reaction followed by metathesis to different counter anions or via acid-base chemistry. The beginning of our work focused on …
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Development of Novel Nicotinic Receptor Mediated Therapeutic Agents: Synthesis and Biological Evaluation of Novel Epibatidine Analogs and the First Total Synthesis of Anabasamine and Related Analogs
… methodology employed a pyridyl anion addition to valerolactone, for anabasamine, or butyrolactone for the nicotine analog, to afford 5-hydroxy-1-(6-methoxy-pyridin-3-yl)-pentan-1-one or 4-hydroxy-1-(6- methoxy-pyridin-3-yl)-butan-1-one, respectively. A reductive amination provided the piperidine …
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EVALUATION OF YAK-KONG SOYBEAN (GLYCINE MAX) FOR ITS PHENOLICS AND METABOLITES WITH A FOCUS ON ATHEROSCLEROSIS PREVENTION
… study found that 5-(3’,4’-dihydroxyphenyl)-γ-valerolactone (DHPV), one of the previously reported major human microbial metabolites of proanthocyanidins, strongly attenuated adhesion of THP-1 monocytes to tumor necrosis factor (TNF)-α-stimulated human umbilical vein endothelial cells (HUVECs). …
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Rational design and synthesis of zeolite acid catalysts for applications in biomass conversion
… for the efficient production of [gamma]-valerolactone from furfural through sequential transfer hydrogenation and hydrolysis reactions catalyzed by a mixture of Brønsted acid zeolite nanosheets and hydrophobic Lewis acid zeolites. Overall, this thesis demonstrates that a detailed …
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