scholarly journals Thermochemical Kinetics of Hydrogen-Atom Transfers between Methyl, Methane, Ethynyl, Ethyne, and Hydrogen

2007 ◽  
Vol 111 (21) ◽  
pp. 4632-4642 ◽  
Author(s):  
Jingjing Zheng ◽  
Yan Zhao ◽  
Donald G. Truhlar
Keyword(s):  
Hydrogen Atom ◽  
Thermochemical Kinetics ◽  
Hydrogen Atom Transfers ◽  
Kinetics Of

ChemInform Abstract: ISOTOPE EFFECTS IN HYDROGEN ATOM TRANSFERS. V. THE REACTIONS OF OLEFINS WITH MERCAPTANS

1976 ◽  
Vol 7 (27) ◽  
pp. no-no
Author(s):  
E. S. LEWIS ◽  
M. M. BUTLER
Keyword(s):  
Hydrogen Atom ◽  
Isotope Effects ◽  
Hydrogen Atom Transfers

ESR study of free-radical intramolecular transfer of a hydrogen atom: mechanisms and kinetics of the reactions

1997 ◽  
Vol 46 (8) ◽  
pp. 1403-1406
Author(s):  
V. A. Radzig ◽  
S. N. Kostritsa
Keyword(s):  
Free Radical ◽  
Hydrogen Atom ◽  
Kinetics Of ◽  
Intramolecular Transfer

Reaction kinetics of hydrogen atom abstraction from isopentanol by the H atom and HO2˙ radical

2018 ◽  
Vol 20 (16) ◽  
pp. 10895-10905
Author(s):  
Prajakta Rajaram Parab ◽  
K. Alexander Heufer ◽  
Ravi Xavier Fernandes
Keyword(s):  
Hydrogen Atom ◽  
Transition State ◽  
Reaction Kinetics ◽  
Hydrogen Atom Abstraction ◽  
Abstraction Reaction ◽  
Kinetics Of ◽  
Ho2 Radical

The formation of the transition state for the H-abstraction reaction from isopentanol by the HO2˙ radical.

Thermochemical kinetics of anthracene pyrolysis

Carbon ◽  
1981 ◽  
Vol 19 (6) ◽  
pp. 421-429 ◽  
Author(s):  
Stephen E. Stein
Keyword(s):  
Thermochemical Kinetics ◽  
Kinetics Of

Effect of Pressure on the Rates of Reaction of Radiolysis Intermediates in Liquid n-Hexane

1971 ◽  
Vol 49 (16) ◽  
pp. 2651-2656 ◽  
Author(s):  
Kamal N. Jha ◽  
Gordon R. Freeman
Keyword(s):  
Carbon Tetrachloride ◽  
Hydrogen Atom ◽  
Pressure Dependence ◽  
Diffusion Coefficients ◽  
Effect Of Pressure ◽  
Scavenging Efficiency ◽  
Kinetics Of ◽  
Positive Ion

The yield of hydrogen from pure hexane, G(H2) = 5.3 ± 0.2 was independent of pressure in the range 1 bar to 4.6 kbars. The G values of H2, HD, and D2 obtained from 11 mol% C6D14 in C6H14 were independent of pressure and were respectively, 4.85, 0.34, and 0.11. The electron and hydrogen atom scavenging efficiencies of carbon tetrachloride and hexadiene-1,3, and the hydrogen atom scavenging efficiency of hexene-1 were independent of pressure. The positive ion scavenging efficiencies of benzene and aniline increased with increasing pressure. The volume of activation for the hydrogen atom reaction with n-hexane is essentially the same as that for the reaction with hexene-1. The pressure dependence of the charge scavenging reactions has been interpreted in terms of the kinetics of spur processes. The treatment is consistent with the fact that the efficiency of the electron scavenging reactions is independent of pressure. The increased efficiency of positive ion reaction under pressure implies that the ratio of the diffusion coefficients of the radiolytic positive ion and electron, D+/D−, increases with increasing pressure.

scholarly journals Site-selective remote C(sp3)–H heteroarylation of amides via organic photoredox catalysis

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Hui Chen ◽  
Wenjing Fan ◽  
Xiang-Ai Yuan ◽  
Shouyun Yu
Keyword(s):  
Hydrogen Atom ◽  
Room Temperature ◽  
Ph Value ◽  
Metal Free ◽  
Selective Functionalization ◽  
Site Selectivity ◽  
Hydrogen Atom Transfers ◽  
Site Selective ◽  
Neutral Conditions ◽  
Potential Complement

Abstract Radical translocation processes triggered by nitrogen-centered radicals (NCRs), such as 1,5-hydrogen atom transfers (1,5-HAT), demonstrated by the well-established Hofmann-Löffler-Freytag (HLF) reaction, provide an attractive approach for the controllable and selective functionalization of remote inert C(sp3)–H bonds. Here we report an amidyl radical-triggered site-selective remote C(sp3)–H heteroarylation of amides under organic photoredox conditions. This approach provides a mild and highly regioselective reaction affording remote C(sp3)–H heteroarylated amides at room temperature under transition-metal free, weakly basic, and redox-neutral conditions. Non-prefunctionalized heteroarenes, such as purines, thiazolopyridines, benzoxazole, benzothiazoles, benzothiophene, benzofuran, thiazoles and quinoxalines, can be alkylated directly. Sequential and orthogonal C–H functionalization of different heteroarenes by taking advantage pH value or polarity of radicals has also been achieved. DFT calculations explain and can predict the site-selectivity and reactivity of this reaction. This strategy expands the scope of the Minisci reaction and serves as its alternative and potential complement.

Isotope effects in hydrogen atom transfers. VI. Radicals from azo compounds in thiophenol

1976 ◽  
Vol 98 (8) ◽  
pp. 2260-2264 ◽  
Author(s):  
E. S. Lewis ◽  
K. Ogino
Keyword(s):  
Hydrogen Atom ◽  
Isotope Effects ◽  
Azo Compounds ◽  
Hydrogen Atom Transfers

scholarly journals Kinetics of Hydrogen Atom Abstraction from Substrate by an Active Site Thiyl Radical in Ribonucleotide Reductase

2014 ◽  
Vol 136 (46) ◽  
pp. 16210-16216 ◽  
Author(s):  
Lisa Olshansky ◽  
Arturo A. Pizano ◽  
Yifeng Wei ◽  
JoAnne Stubbe ◽  
Daniel G. Nocera
Keyword(s):  
Hydrogen Atom ◽  
Ribonucleotide Reductase ◽  
Active Site ◽  
Hydrogen Atom Abstraction ◽  
Thiyl Radical ◽  
Kinetics Of
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