Results 1 to 10 of about 315,338 (165)

Visible Light‐Mediated Dearomative Hydrogen Atom Abstraction/ Cyclization Cascade of Indoles [PDF]

Angewandte Chemie, 2022
The photochemical synthesis of yet unknown 2‐oxospiro[azetidine‐3,3′‐indolines] (17 examples, 80–95 % yield), 2,4‐dioxospiro[azetidine‐3,3′‐indolines] (eight examples, 87–97 % yield), and 1‐oxo‐1,3‐dihydrospiro[indene‐2,3′‐indolines] (17 examples, 85–97 %
Yang Xiong, Johannes Großkopf, Christian Jandl, Thorsten Bach   +3 more
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Selective Hydrogen Atom Abstraction through Induced Bond Polarization: Direct α‐Arylation of Alcohols through Photoredox, HAT, and Nickel Catalysis [PDF]

Angewandte Chemie, 2018
The combination of nickel metallaphotoredox catalysis, hydrogen atom transfer catalysis, and a Lewis acid activation mode, has led to the development of an arylation method for the selective functionalization of alcohol α-hydroxy C-H bonds. This approach
Jack Twilton, Melodie Christensen, Daniel A. DiRocco, Rebecca T. Ruck, Ian W. Davies, David W. C. MacMillan   +5 more
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New Catalytic Radical Process Involving 1,4-Hydrogen Atom Abstraction: Asymmetric Construction of Cyclobutanones

Journal of the American Chemical Society, 2021
While alkyl radicals have been well demonstrated to undergo both 1,5- and 1,6-hydrogen atom abstraction (HAA) reactions, 1,4-HAA is typically a challenging process both entropically and enthalpically.
Jingjing Xie, Pan Xu, Yiling Zhu, Jingyi Wang, Wan‐Chen Cindy Lee, X. Peter Zhang   +5 more
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Mechanisms for Hydrogen-Atom Abstraction by Mononuclear Copper(III) Cores: Hydrogen-Atom Transfer or Concerted Proton-Coupled Electron Transfer?

Journal of the American Chemical Society, 2019
In a possibly biomimetic fashion, formally copper(III)-oxygen complexes LCu(III)-OH (1) and LCu(III)-OOCm (2) (L2- = N,N'-bis(2,6-diisopropylphenyl)-2,6-pyridinedicarboxamide, Cm = α,α-dimethylbenzyl) have been shown to activate X-H bonds (X = C, O ...
Mukunda Mandal, Courtney E. Elwell, Caitlin J. Bouchey, Timothy J. Zerk, William B. Tolman, Christopher J. Cramer   +5 more
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DFT Investigation of Hydrogen Atom Abstraction from NHC-Boranes by Methyl, Ethyl and Cyanomethyl Radicals—Composition and Correlation Analysis of Kinetic Barriers [PDF]

Molecules, 2020
Understanding the hydrogen atom abstraction (HAA) reactions of N-heterocyclic carbene (NHC)-boranes is essential for extending the practical applications of boron chemistry.
Hong-jie Qu, Lang Yuan, Cai-xin Jia, Hai-tao Yu, Hui Xu   +4 more
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Hydrogen Atom Abstraction and Reduction Study of 21-Thiaporphyrin and 21,23-Dithiaporphyrin [PDF]

Molecules
The metal-free porphyrins protonation has gained interest over five decades because its structure modification and hardly monoacid intermediate isolation.
Xiao-Rui Ren, Kang Xing, Teng Liu, Ronghui Cao, Li-Long Dang, Feng Bai, Peng-Cheng Duan   +6 more
doaj   +2 more sources

Mechanistic Insights into the Oxidation of Substituted Phenols via Hydrogen Atom Abstraction by a Cupric–Superoxo Complex

Journal of the American Chemical Society, 2014
To obtain mechanistic insights into the inherent reactivity patterns for copper(I)–O2 adducts, a new cupric–superoxo complex [(DMM-tmpa)CuII(O2•–)]+ (2) [DMM-tmpa = tris((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)amine] has been synthesized and studied ...
Jung Yoon Lee, Ryan L. Peterson, Kei Ohkubo, Isaac Garcia‐Bosch, Richard A. Himes, Julia S. Woertink, Cathy D. Moore, Edward I. Solomon, Shunichi Fukuzumi, Kenneth D. Karlin   +9 more
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Reaction of an Iron(IV) Nitrido Complex with Cyclohexadienes: Cycloaddition and Hydrogen-Atom Abstraction

Inorganic Chemistry, 2014
The iron(IV) nitrido complex PhB(MesIm)3Fe≡N reacts with 1,3-cyclohexadiene to yield the iron(II) pyrrolide complex PhB(MesIm)3Fe(η5-C4H4N) in high yield.
Wei‐Tsung Lee, Ruth A. Juarez, Jeremiah J. Scepaniak, Salvador B. Muñoz, Diane A. Dickie, Haobin Wang, Jeremy M. Smith   +6 more
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DNA Double Strand Cleavage via Interstrand Hydrogen Atom Abstraction [PDF]

Journal of the American Chemical Society, 2013
Double strand breaks (DSBs) are the most deleterious form of DNA damage. Natural products that produce them are potent cytotoxic agents. Designing molecules that produce DSBs via a single chemical event is challenging.
Marisa L. Taverna Porro, Marc M. Greenberg   +1 more
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A comparison of hydrogen abstraction reaction between allyl-type monomers with thioxanthone-based photoinitiators without amine synergists

Frontiers in Chemistry, 2022
The photodriven radical-mediated [3 + 2] cyclization reaction was found to yield polymers efficiently without being hindered by degradative chain transfer.
Xiaotian Zhao, Wen Xu, Xi Chen, Shibo Lin, Xuanhao Li, Lihui He, Xu Liao, Guodong Ye   +7 more
doaj   +1 more source