Antioxidant activity of (+)-catechin. Rate constant for hydrogen-atom transfer to peroxyl radicals

2001 ◽  
Vol 213 (4-5) ◽  
pp. 405-408 ◽  
Author(s):  
Pamela Pedrielli ◽  
Laura M. Holkeri ◽  
Leif H. Skibsted
Keyword(s):  
Antioxidant Activity ◽  
Hydrogen Atom ◽  
Rate Constant ◽  
Hydrogen Atom Transfer ◽  
Peroxyl Radicals ◽  
Atom Transfer

scholarly journals WITHDRAWN: Is antioxidant activity of flavonoids mainly through the hydrogen-atom transfer mechanism?

2018 ◽  
pp. 108081 ◽  
Author(s):  
Xuan Chen ◽  
Zeyuan Deng ◽  
Chengyue Zhang ◽  
Shilian Zheng ◽  
Yao Pan ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Transfer Mechanism ◽  
Atom Transfer

Hydrogen atom transfer reactions of ferrate(vi) with phenols and hydroquinone. Correlation of rate constants with bond strengths and application of the Marcus cross relation

2016 ◽  
Vol 45 (1) ◽  
pp. 70-73 ◽  
Author(s):  
Jianhui Xie ◽  
Li Ma ◽  
William W. Y. Lam ◽  
Kai-Chung Lau ◽  
Tai-Chu Lau
Keyword(s):  
Hydrogen Atom ◽  
Rate Constant ◽  
Rate Constants ◽  
Hydrogen Atom Transfer ◽  
Transfer Reactions ◽  
Atom Transfer ◽  
Bond Strengths ◽  
Oxidation Of Phenols ◽  
Atom Transfer Reactions

The oxidation of phenols (X-CH6H4OH) and hydroquinone (H2Q) by HFeO4− proceeds via a hydrogen atom transfer (HAT) mechanism. The Marcus cross relation can be used to predict the rate constant of HAT from H2Q to HFeO4−.

scholarly journals Hydrogen Atom Transfer from HOO• to ortho‐Quinones Explains the Antioxidant Activity of Polydopamine

2021 ◽  
Author(s):  
Yafang Guo ◽  
Andrea Baschieri ◽  
Fabio Mollica ◽  
Luca Valgimigli ◽  
Jakub Cedrowski ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Atom Transfer

scholarly journals Hydrogen Atom Transfer from HOO• to ortho‐Quinones Explains the Antioxidant Activity of Polydopamine

2021 ◽  
Author(s):  
Yafang Guo ◽  
Andrea Baschieri ◽  
Fabio Mollica ◽  
Luca Valgimigli ◽  
Jakub Cedrowski ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Atom Transfer

Direct Cyclization of Alkenyl Thioester via Transition Metal‐hydrogen Atom Transfer/radical‐polar Crossover Mechanism

2019 ◽  
Author(s):  
Shiori Date ◽  
Kensei Hamasaki ◽  
Karen Sunagawa ◽  
Hiroki Koyama ◽  
Chikayoshi Sebe ◽  
...  
Keyword(s):  
Natural Products ◽  
Hydrogen Atom ◽  
Transition Metal ◽  
Hydrogen Atom Transfer ◽  
Synthetic Method ◽  
Atom Transfer ◽  
Reaction Conditions ◽  
Hydride Hydrogen ◽  
Sulfur Heterocycles ◽  
One Step

<div>We report here a catalytic, Markovnikov selective, and scalable synthetic method for the synthesis of saturated sulfur heterocycles, which are found in the structures of pharmaceuticals and natural products, in one step from an alkenyl thioester. Unlike a potentially labile alkenyl thiol, an alkenyl thioester is stable and easy to prepare. The powerful Co catalysis via a cobalt hydride hydrogen atom transfer and radical-polar crossover mechanism enabled simultaneous cyclization and deprotection. The substrate scope was expanded by the extensive optimization of the reaction conditions and tuning of the thioester unit.</div>

Catalytic Synthesis of Cyclic Guanidines via Hydrogen Atom Transfer and Radical-Polar Crossover

2020 ◽  
Author(s):  
Shunya Ohuchi ◽  
Hiroki Koyama ◽  
Hiroki Shigehisa
Keyword(s):  
Hydrogen Atom ◽  
Functional Group ◽  
Hydrogen Atom Transfer ◽  
Catalytic Synthesis ◽  
Membered Ring ◽  
Biologically Active ◽  
Atom Transfer ◽  
Powerful Method ◽  
Protective Groups ◽  
The Common

A catalytic synthesis of cyclic guanidines, which are found in many biologically active compounds and natu-ral products, was developed, wherein transition-metal hydrogen atom transfer and radical-polar crossover were employed. This mild and functional-group tolerant process enabled the cyclization of alkenyl guanidines bearing common protective groups, such as Cbz and Boc. This powerful method not only provided the common 5- and 6-membered rings but also an unusual 7-membered ring. The derivatization of the products afforded various heterocycles. We also investigated the se-lective cyclization of mono-protected or hetero-protected (TFA and Boc) alkenyl guanidines and their further derivatiza-tions.

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