Reaction Of Hydrogen Abstraction
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Nicotine as a Catalyst for Chlorination Promoted by Hypochlorous Acid: Experimental and Theoretical Studies
There is robust evidence of the hypochlorous acid (HClO)-mediated damage in biomolecules, and nicotine boosts the chlorination potency of HClO. We present experimental and theoretical evidence of the mechanism by which nicotine catalyzes the chlorination of pyranine. The rate constants for chlorination of pyranine by HClO were measured in the presence (5.3 �
Journal of the Brazilian Chemical Society. Publicado em: 2023
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2. Rate Coefficient for the Reaction of Cl Atoms with cis-3-Hexene at 296 ± 2 K
The rate coefficient of the cis-3-hexene + Cl atoms reaction at 296 ± 2 K and 750 ± 10 Torr was determined using the relative rate technique. The reaction was investigated using an 80 L Teflon reaction bag and a gas chromatograph coupled with flame-ionization detection. Chlorine atoms were produced by the photolysis of trichloroacetyl chloride. No previous
J. Braz. Chem. Soc.. Publicado em: 2017-11
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3. Determinação da constante de velocidade absoluta para a reação de abstração de hidrogênio fenólico pelo estado excitado triplete de xantona em acetonitrila e no líquido iônico hexafluorfosfato de 1-butil-3-metil-imidazólio [bmim.PF6]
The triplet excited state of xanthone was generated and characterized by laser flash photolysis in acetonitrile (λmax=620 nm; t=1.8 ms) and in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate [bmim.PF6] (λmax=620 nm; t=3.0 ms). It reacts with phenols yielding the corresponding xanthone ketyl radical. Stern-Volmer plots for the reaction of tripl
Quím. Nova. Publicado em: 2013
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4. DINÂMICA MOLECULAR DA REAÇÃO DE ABSTRAÇÃO DE HIDROGÊNIO NO MH4 (M = C, Si, Ge, Sn) POR ÁTOMOS DE H, F, Cℓ E I INDUZIDA POR PULSO DE LASER DE FEMTOSEGUNDOS. / DYNAMICS OF MOLECULAR HYDROGEN ABSTRACTION REACTION IN MH4 (M = C, SI, GE, SN) IN THE ATOMS H, F, C ℓ EI PULSE INDUCED FEMTOSECOND LASER.
Neste trabalho foram realizadas simulações de dinâmica molecular quântica para as reações de abstração de hidrogênio nas moléculas de metano, silano, germano e estanano por átomos de H, F, Cl, e I sendo realizadas simulações sem e com o uso do pulso de laser de femtosegundos com o objetivo de favorecer a quebra das ligações M-H (M = C, Si, Ge
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2012
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5. Photochemical degradation study of aqueous solutions of polyrthyleneglicol, polyacrylamide and polyvinylpyrrolidone. / Estudo da degradação fotoquímica de soluções aquosas de polietilenoglicol, poliacrilamida e polivinilpirrolidona.
The aim of this work is to apply advanced oxidative processes to study the degradation of industrial wastewater containing water-soluble polymers. Kinetic constants of reactions involved in the oxidation processes were calculated by molecular modeling. In the experimental part the degradation of polyvinylpirrolidone (PVP), polyacrylamide (PAM) and polyethyle
Publicado em: 2007
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6. Poli(oxido de etileno-co-epicloridrina) : degradação foto-oxidativa e termica, e blenda com polipropileno
Polymers derived from ethylene oxide and epichlorohydrin, like poly(epichlorohydrin-co-ethylene oxide) elastomer, are studied as polymer electrolyte for application in photo-electrochemical devices. These materiaIs present the ability to form complexes with alkali salts, presenting high ionic conductivity. In these devices the conversion of the solar energy
Publicado em: 2003
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7. Photochemistry of cyclic vicinal tricarbonyl compounds. Photochemical reaction of 1,2,3-Indanetrione with 2,3-dimethyl-2-butene: hydrogen abstraction and photocycloaddition
A irradiação na região do ultravioleta de 1,2,3-indanotriona, em presença de 2,3-dimetil-2-buteno, em diclorometano, leva a uma mistura complexa de produtos formados a partir de reações de abstração de hidrogênio, fotocicloadição [2pi+2pi] (reação de Paternò-Büchi) e fotocicloadição [4pi+2pi]. A distribuição de produtos é dependente de fa
Journal of the Brazilian Chemical Society. Publicado em: 2000-10
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8. Oxidação de cicloexano por terc-butil hidroperoxido catalisada por complexos de ferro (III) e cobre (II) soluveis em cicloexano
Cyclohexane oxidation by tert-butyI hydroperoxide in the presence of Fe(tma)3, Fe(fod)3, Cu(tma)2 and [Cu(en)2](NO3)2 was studied under reflux and under an oxygen pressure of 25 bar at 70°C. The iron catalysts produced cyclohexanone and cyclohexanol as main products, while the copper catalysts form cyclohexene as well. Over-oxidation produts were formed in
Publicado em: 1997
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9. Activation of neocarzinostatin chromophore and formation of nascent DNA damage do not require molecular oxygen.
Thiol-activated neocarzinostatin chromophore abstracts tritium from the 5', but not from the 1' or 2' positions of deoxyribose in DNA and incorporates it into a stable, non-exchangeable form. The abstracted tritium remains covalently associated with the chromophore or its degradation product after treatment with acid or alkali, respectively. Drug activation
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10. Photochemical dehydrogenation of 5, 6-dihydropyrimidines.
5, 6-Dihydropyrimidines can be oxidized photochemically to the original pyrimidines with light of lambda greater than 300 nm in the presence of transition metal salts which act as sensitizers. A hydrogen atom abstraction by hydroxyl radical is suggested as the reaction mechanism.
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11. Alkyl-metal and aryl-metal bond chemistry in coordinately unsaturated polynuclear metal complexes
A new class of coordinately unsaturated polynuclear rhodium and iridium alkyl, benzyl, and aryl derivatives of the form [RM(1,5-cyclooctadiene)]x have been prepared by the reaction of the organolithium reagent with the cyclooctadienemetal chlorides at -78°C. The x-ray crystal structure of [μ-CH3Rh (1,5-cyclooctadiene)]2 is reported. The analogous iridium d
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12. Steroidal Free Radicals as Possible Intermediates in the Biosynthesis of C19-△16-Steroids
Treatment of deoxycorticosterone with reagents that abstract a hydrogen atom from the C-21-hydroxyl group leads to the formation of androsta-4,16-dien-3-one. In vitro incubations of [1,2-3H]deoxycorticosterone with homogenates of boar testis tissue produce the tritiated dienone. This reaction can be formulated as an abstraction of hydrogen from the C-21-hydr