ChemInform Abstract: ELECTRON TRANSFER PROCESSES. PART 28. NUCLEOPHILIC SUBSTITUTION IN ORGANOMERCURY HALIDES BY A FREE-RADICAL CHAIN PROCESS

1982 ◽  
Vol 13 (23) ◽  
Author(s):  
G. A. RUSSEL ◽  
J. HERSHBERGER ◽  
K. OWENS
Keyword(s):  
Electron Transfer ◽  
Free Radical ◽  
Nucleophilic Substitution ◽  
Chain Process ◽  
Radical Chain ◽  
Transfer Processes ◽  
Electron Transfer Processes ◽  
Radical Chain Process

Free radical chain reactions of ate complexes. Electron transfer processes 42

1988 ◽  
Vol 1 (5) ◽  
pp. 299-303 ◽  
Author(s):  
Glen A. Russell ◽  
Shuisheng Hu ◽  
S. Herron ◽  
Woonphil Baik ◽  
P. Ngoviwatchai ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Free Radical ◽  
Radical Chain ◽  
Chain Reactions ◽  
Transfer Processes ◽  
Electron Transfer Processes

On the electron transfer and hydrogen atom abstraction mechanism for 1-benzyl-1,4-dihydronicotinamide reduction of benzoquinones

1990 ◽  
Vol 68 (10) ◽  
pp. 1662-1667 ◽  
Author(s):  
Dennis D. Tanner ◽  
Abdelmajid Kharrat ◽  
H. Oumar-Mahamat
Keyword(s):  
Electron Transfer ◽  
Free Radical ◽  
Hydrogen Atom ◽  
Hydrogen Atom Transfer ◽  
Chain Process ◽  
Single Electron Transfer ◽  
Second Order Reaction ◽  
Radical Chain ◽  
Radical Reduction ◽  
Radical Chain Process

The reduction of p-benzoquinone (BQ) by 1-benzyl-1,4-dihydronicotinamide (BNAH) proceeds by a free-radical chain mechanism initiated by single electron transfer (SET). In dry deoxygenated acetonitrile, the chain, whose propagation steps contain a SET–hydrogen atom transfer sequence, could be inhibited by dinitrobenzene and initiated by di-tert-butylperoxyoxalate. The reduction does not follow second-order reaction kinetics. The fractional order of each reactant was found to be 0.80 and 1.36 for BNAH and BQ, respectively. The AG0 values for both the initiation and the propagation steps were evaluated electro-chemically (CV) and were found to be of a reasonable magnitude to sustain a free-radical chain process. Keywords: 1-benzyl-1,4-dihydronicotinamide, p-benzoquinone, free radical, reduction.

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