Topic
Hydrogen atom abstraction
About: Hydrogen atom abstraction is a research topic. Over the lifetime, 7059 publications have been published within this topic receiving 151781 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: The photolyses of 5α-cholestane-3β,6β-diol 3-acetate (1), 5α cholestan-2β-ol (4), 5β-choline-4β-OL (8), (20R)-pregn-5-ene-3 β,20-dioxioxioxyl-20diol (3-β,20dioxyl)-3-acetates (19), and dihydrotigogenin-3acetate(25) in the presence of
Abstract: The photolyses of 5α-cholestane-3β,6β-diol 3-acetate (1), 5α-cholestan-2β-ol (4), 5α-cholestan-4β-ol (8), (20R)-pregn-5-ene-3β,20-diol 3-acetate (19), (20S)-pregn-5-ene-3β,20-diol 3-acetate (21), and dihydrotigogenin 3-acetate (25) in the presence of iodine and various hypervalent organoiodine compounds lead to alkoxyl radicals which undergo intramolecular hydrogen abstraction to produce, in most cases, 1,4-iodohydrins and tetrahydrofuran derivatives.
67 citations
••
67 citations
••
TL;DR: In this paper, a micro-reactor coupled with online gas chromatography/mass spectrometry with a flame ionization detector was used for lignin solvolytic conversion.
Abstract: The benefit of using hydrogen donor solvents in lignin solvolytic conversion was studied using a micro reactor coupled to online gas chromatography/mass spectrometry with a flame ionization detector. This system is able to achieve very high heating rates of reactants and capable of analyzing the reaction products immediately after the reaction is completed, thus allowing for probing “semi” time-resolved reactions occurring during lignin conversion. These features have been impossible for the batch reactors typically employed in previous solvent liquefaction studies. The study showed that the hydrogen donor solvents tetralin and isopropanol were effective in converting lignin into short-chain alkyl phenols (SCAP) at high yield. The yield of SCAP increased with an increasing reaction temperature over the range of 300–400 °C and reaction time over the range of 5–15 min, which is attributed to stabilization of lignin-derived products by hydrogen abstraction from the hydrogen donor solvents. The molecular weig...
66 citations
••
TL;DR: The Barton Reaction as discussed by the authors is a photolytic decomposition of nitrites to alkoxy radicals, followed by a stereoselective intramolecular hydrogen abstraction by the latter and recombination of the resulting carbon radicals with NO to form nitrose-monomers, dimers or oximes.
66 citations
••
TL;DR: In this article, an application of the reaction class transition state theory (RC-TST) in predicting thermal rate constants of the hydrogen abstraction reactions H + H−C(sp3) where C(sp 3) is a saturated carbon atom is presented.
Abstract: We present an application of the reaction class transition state theory (RC-TST) in predicting thermal rate constants of the hydrogen abstraction reactions H + H−C(sp3) where C(sp3) is a saturated carbon atom. Combining the RC-TST with the linear energy relationship (LER) allows rate constants of any reaction in the class to be estimated from only reaction energy information. We have derived from first-principles all parameters for the RC-TST/LER method so rate constants for any reaction in this class can be predicted from only reaction energy, that can easily be computed from either the density functional theory or semiempirical molecular orbital theory. We have performed error analyses for a large number of reactions in the above class for which some experimental measurements or estimates are available. By comparisons with results from full TST/Eckart calculations we also found the RC-TST/LER method is quite cost-effective and has accuracy comparable to first-principles predictions using more rigorous m...
66 citations