Study of the formation of a .sigma.,.pi.-vinyl ligand by hydrogen atom transfer from a coordinated dimethylamide to a perpendicularly bonded ethyne ligand. Preparation and characterization of (PMe2Ph)Cl2W(.mu.-NMe2)(.mu.-.eta.1,.eta.2-CHCH2)(.mu.-.eta.2,.eta.1-CH2NMe)WCl(NMe2)(PMe2Ph)

1986 ◽  
Vol 108 (5) ◽  
pp. 989-999 ◽  
Author(s):  
Kazi J. Ahmed ◽  
Malcolm H. Chisholm ◽  
Kirsten. Folting ◽  
John C. Huffman
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Atom Transfer

scholarly journals Synthesis and Characterization of Ruthenium Bis(β-diketonato) Pyridine-Imidazole Complexes for Hydrogen Atom Transfer

2007 ◽  
Vol 46 (26) ◽  
pp. 11190-11201 ◽  
Author(s):  
Adam Wu ◽  
Joshua Masland ◽  
Rodney D. Swartz ◽  
Werner Kaminsky ◽  
James M. Mayer
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Synthesis And Characterization ◽  
Atom Transfer ◽  
Imidazole Complexes

scholarly journals Formation and characterization of a reactive chromium(v)–oxo complex: mechanistic insight into hydrogen-atom transfer reactions

2015 ◽  
Vol 6 (2) ◽  
pp. 945-955 ◽  
Author(s):  
Hiroaki Kotani ◽  
Suzue Kaida ◽  
Tomoya Ishizuka ◽  
Miyuki Sakaguchi ◽  
Takashi Ogura ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Reaction Mechanisms ◽  
Hydrogen Atom Transfer ◽  
Transfer Reactions ◽  
Atom Transfer ◽  
Oxidation Potentials ◽  
Mechanistic Insight ◽  
Atom Transfer Reactions ◽  
Insight Into

Mechanistic insights were gained into hydrogen-atom transfer reactions from benzyl alcohol derivatives with different oxidation potentials to a highly reactive Cr(v)–oxo complex to reveal switching of reaction mechanisms.

Spontaneous hydrogen-atom transfer upon ionization: characterization of enol radical cations

1992 ◽  
Vol 275 ◽  
pp. 249-255 ◽  
Author(s):  
Jerzy Gȩbicki ◽  
Andrzej Marcinek ◽  
Jacek Michalak ◽  
Jacek Rogowski ◽  
Thomas Bally ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Radical Cations ◽  
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.

Sulfamides Direct Radical-Mediated Chlorination of Aliphatic C–H Bonds

2019 ◽  
Author(s):  
Melanie Short ◽  
Mina Shehata ◽  
Matthew Sanders ◽  
Jennifer Roizen
Keyword(s):  
Hydrogen Atom ◽  
Transfer Reaction ◽  
Hydrogen Atom Transfer ◽  
Chain Propagation ◽  
Propagation Mechanism ◽  
Atom Transfer ◽  
Radical Chain ◽  
Radical Intermediates ◽  
Transfer Processes ◽  
Unusual Position

Sulfamides guide intermolecular chlorine transfer to gamma-C(sp<sup>3</sup>) centers. This unusual position-selectivity arises because accessed sulfamidyl radical intermediates engage in otherwise rare 1,6-hydrogen-atom transfer processes. The disclosed chlorine-transfer reaction relies on a light-initiated radical chain-propagation mechanism to oxidize C(sp<sup>3</sup>)-H bonds.

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