Results 281 to 290 of about 43,577 (345)

Diastereoselective Radical‐Mediated Hydrogen‐Atom Abstraction

Angewandte Chemie International Edition, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Renaud, Philippe, Beaufils, Florent, Feray, Laurence, Schenk, Kurt   +3 more
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Second hydrogen atom abstraction by molecular ions

Journal of Mass Spectrometry, 2017
We report the observation of a new physical phenomenon of the addition of 2 hydrogen atoms to molecular ions thus forming [M + 2H]+ ions. We demonstrate such second hydrogen atom abstraction onto the molecular ions of pentaerythritol and trinitrotoluene (TNT). We used both gas chromatography mass spectrometry (GC‐MS) with supersonic molecular beam (SMB)
Svetlana Tsizin, Boaz Seemann, Tal Alon, Aviv Amirav   +3 more
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Hydrogen abstraction from hydrogenated amorphous silicon surface by hydrogen atoms

Applied Physics Letters, 1986
HD 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.
Yasuji Muramatsu, Norikuni Yabumoto
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Insertion vs. abstraction in the atomic hydrogen + molecular hydrogen .fwdarw. molecular hydrogen + atomic hydrogen exchange reaction

The Journal of Physical Chemistry, 1986
At collision energies above 1 eV an insertion mechanism is shown to dominate in the hydrogen exchange reaction. The cone of acceptance for reaction is found to be made up of an inner cone (Le., for more nearly collinear collisions) where exchange proceeds by abstraction and an outer spherical sector where the mechanism is by insertion.
I. Schechter, R. Kosloff, R. D. Levine
openaire   +1 more source

ChemInform Abstract: THE TEMPERATURE DEPENDENCE OF HYDROGEN ABSTRACTION REACTIONS: ATOMIC FLUORINE + HYDROGEN CHLORIDE, ATOMIC FLUORINE + HYDROGEN BROMIDE, ATOMIC FLUORINE + DEUTERIUM BROMIDE, AND ATOMIC FLUORINE + HYDROGEN IODIDE

Chemischer Informationsdienst, 1980
AbstractDie Temp‐Abhängigkeit der absoluten Geschwindigkeitskonstanten der Titelreaktionen zwischen 195 und 373 K wird mit einer Laser‐Photolyse/ IR‐Fluoreszenz‐Methode untersucht und ausgeprägtes nichtlineares Arrhenius‐Verhalten beobachtet.
E. + WUERZBERG, P. L. HOUSTON
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Enzymatic hydrogen atom abstraction from polyunsaturated fatty acids

Chemical Communications, 2003
The oxidation of polyunsaturated fatty acids such as arachidonic and linoleic acid initiates a plethora of cell signaling pathways in animals and plants. The chemistry of the enzymatic oxidation has been investigated for several enzymes, most notably prostaglandin synthase and the lipoxygenases, revealing many surprises and impressive examples of ...
Chris M, McGinley, Wilfred A, van der Donk   +1 more
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Concerted hydrogen-atom abstraction in photosynthetic water oxidation

Current Opinion in Plant Biology, 2000
Photosystem 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 ...
K L, Westphal, C, Tommos, R I, Cukier, G T, Babcock   +3 more
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Hydrogen bonding tunes the early stage of hydrogen-atom abstracting reaction

Phys. Chem. Chem. Phys., 2014
The 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, Lei, Liu, Junsheng, Chen, Keli, Han   +3 more
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ChemInform Abstract: Organic Synthesis Using Hydrogen Atom Abstraction Reactions

ChemInform, 1995
AbstractChemInform 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.
G. A. KRAUS, M. D. SCHWINDEN
openaire   +1 more source