Results 211 to 220 of about 1,088 (243)
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Hydrogen bonding tunes the early stage of hydrogen-atom abstracting reaction
Phys. Chem. Chem. Phys., 2014The spontaneous and collision-assisted hydrogen-atom abstracting reaction dynamics of triplet benzil are investigated through a combination of transient absorption spectroscopy with TD-DFT calculations.
Yang Yang +3 more
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Hydrogen abstraction from hydrogenated amorphous silicon surface by hydrogen atoms
Applied Physics Letters, 1986HD formation reaction was investigated in H2 plasma over deuterium-incorporating hydrogenated amorphous silicon (a-Si:H:D). The activation energy of the reaction was determined to be 2.4±0.7 kcal mol−1, which was consistent with the abstraction reaction of hydrogen from some silane derivatives by hydrogen atoms.
Norikuni Yabumoto, Yasuji Muramatsu
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Absolute Rate Constants for Allylic Abstraction of Hydrogen by Atomic Hydrogen
The Journal of Physical Chemistry A, 1997The solution-phase absolute rate constants (23 °C) for the abstraction by atomic hydrogen of 1°, 2°, and 3° allylic hydrogens have been calculated by determining the relative rates of abstraction vs addition, since the absolute rate constants for addition is known.
Liying Zhang +2 more
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The ability of triplet nitrenes to abstract hydrogen atoms
Journal of Physical Organic Chemistry, 2010AbstractThe enthalpies for H‐atom abstraction reactions by triplet imidogen as well as ethyl, alkoxycarbonyl, acyl, phenyl, and vinyl nitrenes were calculated using density functional theory calculations. These calculations show that H‐atom abstraction reactions are only feasible for triplet imidogen, alkoxycarbonyl, and acyl nitrenes in solution.
Christopher M. Hadad +3 more
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ChemInform Abstract: Enantioselective Hydrogen‐Atom Abstraction by Homochiral Silanethiyl Radicals.
ChemInform, 1995AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Brian P. Roberts, Hai-Shan Dang
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Hydrogen atom abstraction by a high-spin [FeIII=S] complex
Chem, 2023Iron sulfur clusters are critical to a plethora of biological processes; however, little is known about the elementary unit of these clusters, namely the [Fe=S]n+ fragment. Here, we report the synthesis and characterization of a terminal iron sulfido complex.
Juan A. Valdez-Moreira +6 more
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Generation of Diazomethyl Radicals by Hydrogen Atom Abstraction and Their Cycloaddition with Alkenes
Angewandte Chemie International Edition, 2021AbstractA general catalytic methodology for the synthesis of pyrazolines from α‐diazo compounds and conjugated alkenes is reported. The direct hydrogen atom transfer (HAT) process of α‐diazo compounds promoted by the tert‐butylperoxy radical generates electrophilic diazomethyl radicals, thereby reversing the reactivity of the carbon atom attached with ...
Yong‐Liang Su +3 more
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Fluorescence Quenching of Benzaldehyde in Water by Hydrogen Atom Abstraction
ChemPhysChem, 2016AbstractWe computed the mechanism of fluorescence quenching of benzaldehyde in water through relaxed potential energy surface scans. Time‐dependent density functional theory calculations along the protonation coordinate from water to benzaldehyde reveal that photoexcitation to the bright ππ* (S3) state is immediately followed by ultrafast decay to the ...
Katharyn Fletcher +2 more
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ChemInform Abstract: Temperature Dependence of the Homolytic Abstraction of Benzylic Hydrogen by Bromine Atom [PDF]
Chemischer Informationsdienst, 1986 L'enlevement de l'hydrogene benzylique par l'atome de brome a partir du toluene et chloro-4 toluene a ete etudie en mesurant les vitesses relatives a 45°, 25°, 10°, 0°, −18,5°, −32° et −50°C. Les vitesses des chloro-3, bromo-4-, methyl-4- et nitro-4 toluenes par rapport au toluene sont determinees a −50 ...
J. G. Wright, Richard D. Gilliom
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Concerted hydrogen-atom abstraction in photosynthetic water oxidation
Current Opinion in Plant Biology, 2000Photosystem II evolves oxygen by using water in the unlikely role of a reductant. The absorption of sunlight by chlorophyll produces highly oxidizing equivalents that are filled with electrons stripped from water. This proton-coupled redox chemistry occurs at the oxygen-evolving complex, which contains a tetramanganese cluster, a redox-active tyrosine ...
Gerald T. Babcock +3 more
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