Results 301 to 310 of about 205,731 (373)

Recent Advances in Radical-Involved Alkynylation of Unactivated C(sp3)–H Bonds by Hydrogen Atom Abstraction

Synlett : Accounts and Rapid Communications in Synthetic Organic Chemistry, 2020
The direct C(sp3)–H functionalization is one of the major research topics in synthetic chemistry since C(sp3)–H bonds are ubiquitous in every aspect of chemistry.
Zheng-Hua Zhang, He Wei, Zhong-Liang Li, Xin‐Yuan Liu   +3 more
semanticscholar   +1 more source

Diastereoselective Radical‐Mediated Hydrogen‐Atom Abstraction

Angewandte Chemie International Edition, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Philippe Renaud, Florent Beaufils, Kurt Schenk, Laurence Feray   +3 more
openaire   +5 more sources

Radiation Abstraction of Hydrogen Atoms in Single Crystals of Thymine

The Journal of Chemical Physics, 1972
Single crystals of both thymine monohydrate and anhydrous thymine were irradiated at 77°K and the radicals induced were analyzed with ESR spectroscopy. The radical species, formed by abstraction of a hydrogen atom from nitrogen, was studied in detail. Molecular orbital calculations suggest that the abstraction takes place from N(1).
A. Dulčić, J. N. Herak
openaire   +2 more sources

ChemInform Abstract: Transition State Geometry in Radical Hydrogen Atom Abstraction [PDF]

ChemInform, 2012
AbstractReview: 78 refs.
Evgeny Denisov, Alexander F Shestakov, T. G. Denisova   +2 more
openaire   +2 more sources

Hydrogen Abstraction from the Hydrazine Molecule by an Oxygen Atom

The Journal of Physical Chemistry A, 2014
Thermochemical and kinetics properties of the hydrogen abstraction from the hydrazine molecule (N2H4) by an oxygen atom were computed using high-level ab initio methods and the M06-2X DFT functional with aug-cc-pVXZ (X = T, Q) and maug-cc-pVTZ basis sets, respectively.
Francisco B. C. Machado, Roberta Jachura Rocha, Hans Lischka, Hans Lischka, Luiz F. A. Ferrão, Koshun Iha, José Atílio Fritz Fidel Rocco, Rene F. K. Spada, Orlando Roberto-Neto   +8 more
openaire   +3 more sources

Kinetics of Hydrogen Abstraction Reactions of Methyl Palmitate and Octadecane by Hydrogen Atoms

The Journal of Physical Chemistry A, 2019
Hydrogen abstractions play a crucial role in the consumption of fuel molecules during fuel pyrolysis and combustion processes. In this study, a generalized energy-based fragmentation approach was used to obtain CCSD(T)-F12a/cc-pVTZ energy barriers of hydrogen abstraction reactions by hydrogen atoms from methyl palmitate (C15H31COOCH3), a key component ...
Yawei Chi, Xiaoqing You
openaire   +3 more sources

Dynamic Hydroxylation Enhances Hydrogen Atom Abstraction from Water for Nitrogen Fixation Revealed by Isotope Labeling in Situ Fourier-Transform Infrared Spectroscopy.

ACS Nano
Employing water as a hydrogen source to participate in the hydrogen atom transfer (HAT) process is a low-cost and carbon-free process demonstrating great economic and environmental potential in catalysis.
Xing'an Dong, Xian Shi, Zhihao Cui, Weidong Dai, Fan Dong   +4 more
semanticscholar   +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
openaire   +2 more sources

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, Ke-Li Han, Lei Liu, Junsheng Chen   +3 more
openaire   +3 more sources

A chiral hydrogen atom abstraction catalyst for the enantioselective epimerization of meso-diols

Science
Hydrogen atom abstraction is an important elementary chemical process but is very difficult to carry out enantioselectively. We have developed catalysts, readily derived from the Cinchona alkaloid family of natural products, which can achieve this by ...
Antti S. K. Lahdenperä, Jyoti Dhankhar, Daniel J. Davies, Nelson Y. S. Lam, P. D. Bacoş, Karen de la Vega-Hernández, Robert J. Phipps   +6 more
semanticscholar   +1 more source