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Showing 1 to 20 of 213 for “"Phenols"”.
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Regiospecific Synthesis of Ortho Substituted Phenols
… major concern in the regiospecific synthesis of phenols. AES and Directed <em>ortho</em>--Metalation (DoM) are the only ways to directly substitute a proton on an aromatic ring and to synthesize regiospecifically substituted phenols. Phenol is a versatile precursor to a large collection of drugs, …
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Clay mineral catalysed oxidation of phenols
… of our catalysts. Several products, including diphenols, quinones and carboxylic acids, have been identified within the degradation pathway to carbon dioxide and water. Different product isomer ratios are produced depending upon whether the process is thermal or photochemical. Of the catalysts …
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A study of brom and nitroso phenols
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemistry, 1890
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The removal of phenols from oily wastewater by chlorine dioxide
Treatability studies were performed on oily wastewaters produced by petroleum and canning industries. Chlorine dioxide was used for the removal of phenolic compounds from these oily wastewaters. Most of phenolic compounds can be destroyed by chlorine dioxide within 15 minutes if CI02-to-phenol …
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Analogue enrichment of aromatic degradation through application of lignin-derived phenols
… soils using naturally occurring lignin-derived phenols (13C-vanillin substrates). The influence of vanillin substrates on the 13C-signatures as identified on the 16S rRNA gene profiles present in the bacterial population were explored using metagenomic procedures _ primarily based on DNA stable …
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Influence of pH and NOM on Sorption of Phenols onto Aquifer Material
… of pH and NOM on the sorption of three different phenols (2-methyl-4,6-dinitrophenol, 2,4,6-trichlorophenol and pentachlorophenol) on a natural sandy aquifer material collected from a bank filtration site was studied in flow through column experiments. In first step the sorption coefficients of …
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Factors Controlling the Position of Alkylation of Alkali-Metal Salts of Phenols
Made available in DSpace on 2015-05-12T17:02:39Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 5902060.PDF: 6334086 bytes, checksum: 054a81dc47e8f2ad4892dfd75291ab32 (MD5) Previous issue date: 1959
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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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Two-Phase Partitioning System Using Elvax 40W Polymer for the Biodegradation of Aqueous Phenols
… first order dependence on the absorption of the phenols tested. Activation energies were also determined for each analyte. Rate constants were on the order of 10-4 min-1. Activation energy ranged from 19-46 kJ/mol. Regeneration tests showed that a release of analyte from the polymer is possible …
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Admicelle-Based Solid Phase Extraction of Phenols Using Dialkylammonium Surfactant in the Hydroxide Form
… strong base, aiding in the extraction of acidic phenols which are difficult to extract because of their differing polarities. The surfactant-silica admicelle parameters were optimized for the efficient extraction of eight phenols. Adsorbed phenols were eluted from the sorbent using small volumes …
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Effects of Activated Carbon on Reactions of Free and Combined Chlorine With Phenols (Chlorination, Gac)
… from water. Free chlorine reacts with a group of phenols (phenol, guaiacol, catechol, 2,6-dimethoxyphenol, p-chlorophenol) in dilute aqueous solutions (10('-5)M), to produce mono-, di-, or trichloroderivatives. When free chlorine reacts with phenols adsorbed on granular activated carbon (GAC), …
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One-Pot Synthesis of meta-Substituted Phenols via Palladium-Catalyzed Suzuki-Miyaura Cross-Coupling and Oxidation
… a two-step synthesis of meta-substituted phenols in one pot, in good to excellent yield. A Pd2+ source is the catalyst for both steps of the synthesis, which includes a cross-coupling reaction between -chlorocyclohexenones with boronic acids, followed by aerobic oxidation of the resulting …
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On the use of selected derivatives in the specific characterization of alcohols, phenols, amines and mercaptans
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemistry, 1926
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Chemical Identification and Flavor Profile Analysis of Iodinated Phenols Produced From Disinfection of Spacecraft Drinking Water
… by-products: 2-iodophenol, 4-iodophenol, diiodophenols, and 2,4,6-triiodophenol. Most reaction conditions studied resulted in the formation of all or some of the specified iodophenols. The initial mass ratio of iodine to phenol was the major determining factor in the concentrations and types of …
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Gas-Phase Formation of Environmentally Persistent Free Radicals from Thermal Degradation of Catechol, Hydroquinone, Phenols and Tobacco
… Isolation in which catechol, hydroquinone, phenols and Tobacco were pyrolyzed in both low and atmospheric pressures reactor that was directly connected to a liquid nitrogen-cooled cold finger located in the EPR cavity of a Bruker EPR spectrometer. Comprehensive potentially persistent free …
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A study of cashew nut shell liquid purification and the synthesis of nonionic surfactants from the component phenols
The major phenolic lipids from natural and technical Cashew Nut-Shell Liquids were isolated by various techniques including precipitation, chemical purification, distillation, phase separation and chromatography. Cardanol, 3-pentadecyl phenol and cardol were polyethoxylated under base catalysed …
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