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Showing 1 to 19 of 19 for “"naphthalenes"”.
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The synthesis of derivatives of naturally occurring naphthalenes
The ansamycins are a large group of natural products which have attracted considerable attention, largely as a result of their range of biological activity. The laboratory synthesis of an ansamycin has been simplified into the independent construction of the aromatic nucleus and the ansa chain, …
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The metabolism of highly chlorinated naphthalenes by the albino rat and the calf
… in vivo, the metabolism or highly chlorinated. naphthalenes by the albino rat and the calf. Three studies were made. The first involved the determination of the amount of uptake of hexaehloronaphthalene by rat liver and kidney tissue. Similar studies on calf liver and kidney also were made. …
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I. A Route to 2,3-Disubstituted Naphthalenes. Ii. Restricted Rotation in the Aminocollidine Series
Made available in DSpace on 2014-12-05T19:36:20Z (GMT). No. of bitstreams: 1 0016390.pdf: 5615967 bytes, checksum: c4e1095f7926bcae14ffaabb8682d63d (MD5) Previous issue date: 1956
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Photolysis of (Halomethyl)naphthalenes: An Investigation of the Heterolysis and Homolysis of Carbon-Halogen Bonds in (Arylmethyl)halides
The photolysis of (halomethyl)naphthalenes in methanol and cyclohexane was examined by means of product and quantum yield studies, sensitization and quenching experiments, and the technique of transient absorption spectroscopy. Evidence is presented for three modes of heterolytic bond cleavage. The …
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The relation of certain pelleted feeds to bovine hyperkeratosis
… lubricant (Lot I) that contained no chlorinated naphthalenes. Two calves were assigned to each lot of pellets and individually fed the amount of pellets they would eat twice daily. These calves remained normal throughout 135 days of feeding. There was no evidence of toxicity of these pellets. The …
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The Synthesis of Naphthalene-Containing Compounds and Materials Using Benzannulation Reactions
… or cyclized to isolate substituted ortho-naphthalenes. Through our fundamental studies into this transformation, we have shown it serves as a versatile reaction in the organic synthetic chemists toolbox to access novel aromatic architectures.
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Development of Nickel and Zirconium Mediated Cycloadditions for the Synthesis of Substituted Pentacene
… alkynes allowed Bergman aromatization of the naphthalenes to occur. The substituted anthracenes formed could then be treated with bis(triphenylphosphine)dichloro-nickel(II) and sodium amalgam to produce a nickelaryne. Application of the [2+2+2] cycloaddition methodology to the longer …
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Defined Dimensional Alterations in Enzyme Substrates. Synthesis and Enzymatic Evaluation of Some Lin-Naphthopurines
… synthesis of tetra-beta-substituted naphthalenes via a combination of bicyclo{4.2.0}octa-1,3,5-triene and aryl trimethylsilyl chemistry led to the synthesis of benzimidazo{5,6-g}-8H-quinazolin-9-one and benzimidazo{5,6-g}-6H,8H-quinazoline-7,9-dione 4.8 (ANGSTROM) laterally extended …
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Some benzo- and naphtopyrans by novel cyclisations
… nitrate. It has also been shown that these naphthalenes cyclise readily and in high yield to give naphthopyrans when treated with potassium-t-butoxide in dimethylformamide under anaerobic conditions. In order to determine which structural features present in these compounds are required for …
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Techno-economic assessment of jet fuel naphthalene removal to reduce non-volatile particulate matter emissions
Naphthalenes have been identified as a precursor to aviation-attributable black carbon (BC) emissions. Given its 1-2 vol% concentration in jet fuel, there are several refining processes that may be used to remove naphthalene without impacting its ability to meet specification. This study evaluates …
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Synthesis of Conjugated Polymers
… during Scholl reaction, the precursors, oligo-naphthalenes with alkoxy groups capping the 2, 3, 6, and 7-positions had been synthesized. Intramolecular ring fusion via the Scholl reations was tested, but no expected GNRs were formed.
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Syntheses related to some naturally occurring naphthopyranquinones
… and the potential of some of these acylated naphthalenes to be employed in the syntheses of naphtho[2, 3-c]pyrans and naturally occurring quinones has been investigated.
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Structure guided discovery of inhibitors of indoleamine 2,3-dioxygenase (IDO1)
… benzoxazoles, indoles, indan‐1‐ones, quinolines, naphthalenes, coumarins, biphenyls, phenols, 4‐phenylimidazole, pyridines, hydroxyamidines and phenylpyruvic acids. Spectroscopic studies show that these compounds interact with the haem complex present in the IDO1 active site. Of these, …
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Mechanisms of Microbial Methane Production from Sub-Bituminous Australian Coal
… C27 and aromatic compounds, such as methylated naphthalenes, fluorene and phenanthrene. When treated with oxidative chemicals and enzymes mimicking microbial coal degradation, compounds such as acetate, propionate and formate were produced. Methane production and microbial community changes were …
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Temporal and Spatial Assessment of PAHs in Water, Sediment, and Oysters as a Result of the Deepwater Horizon Oil Spill
… with relatively higher percent compositions of naphthalenes and/or phenanthrene occurred in the Sand and Denton 6/28/10 water samples and in the 7/12/10 Gulf Island National Seashore sediment sample. Other sediment samples with tPAH concentrations greater than 1300 ng/g dry weight had diverse …
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Geochemical Reaction Proxies (Parameters) to Remotely Monitor In Situ Chemical Reactions and Assess the Extent of Bitumen Upgrading during Thermal Recovery Processes
… as n-C9 to n-C17 alkanes, isoprenoid alkanes, naphthalenes, phenanthrenes, anthracenes, dibenzothiophenes increasing. Established reaction proxies, which are a variety of molecular ratios used in geochemical source rock evaluation procedures, concentration data and vacuum residue fraction show …
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Volatile organic compounds in seawater
… from C13-C17, and alkylated benzenes and naphthalenes were all abundant after an oil spill several miles from the sampling site. C2- and C3- benzenes were the most persistently abundant volatile compounds and their concentrations were observed to be 2-10 times higher than average …
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Characterisation and environmental effects of unresolved complex mixtures of hydrocarbons
… the diaromatic fraction of alkyl and cycloalkyl naphthalenes. This was supported by, FIMS analysis of the fractions prior to oxidation. As an investigation of the environmental toxicity of UCMs, the effect of a saturated aliphatic UCM, and its chemical oxidation products, on the feeding rate of …
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Thermodynamische Untersuchungen und semiempirische Berechnungen an Dihydroxynaphthalinen und einfachen Naphthalinderivaten
Die Wirksamkeit eines Arzneistoffs hängt in entscheidendem Maße von seiner Wasserlöslichkeit ab. Schlechte Löslichkeit bedeutet eine große positive Änderung der Freien Energie während des Lösevorgangs. Hinweise zu finden, die zum besseren Verständnis des Lösungsprozesses führen, ist das Ziel dieser …