ChemInform Abstract: Synthesis and Characterization of [(η5- C5H5)V(CO)3H]- , a New Anionic Vanadium Carbonyl Hydride, and a Study of Its Reduction Reaction with Organic Halides. Oberservation of a Free-Radical Chain Process Having an Extremely Rapid Meta

1978 ◽  
Vol 9 (18) ◽  
Author(s):  
R. J. KINNEY ◽  
W. D. JONES ◽  
R. G. BERGMAN
Keyword(s):  
Free Radical ◽  
Reduction Reaction ◽  
Synthesis And Characterization ◽  
Chain Process ◽  
Radical Chain ◽  
Organic Halides ◽  
Radical Chain Process

The First Polycondensation through a Free Radical Chain Process

1997 ◽  
Vol 119 (37) ◽  
pp. 8718-8719 ◽  
Author(s):  
Takeshi Endo ◽  
Nobuo Torii ◽  
Toshikazu Takata ◽  
Tsutomu Yokozawa ◽  
Toshio Koizumi
Keyword(s):  
Free Radical ◽  
Chain Process ◽  
Radical Chain ◽  
Radical Chain Process

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.

Free Radical Bromination of Saturated Hydrocarbons using Bromine and Mercuric Oxide

1972 ◽  
Vol 50 (19) ◽  
pp. 3109-3116 ◽  
Author(s):  
N. J. Bunce
Keyword(s):  
Free Radical ◽  
Hydrogen Abstraction ◽  
Chain Process ◽  
Mercuric Oxide ◽  
Saturated Hydrocarbons ◽  
Radical Chain ◽  
Radical Bromination ◽  
Mercury Oxide ◽  
Alkyl Bromides ◽  
Radical Chain Process

The reaction of alkanes with a mixture of bromine and mercuric oxide gives alkyl bromides in preparatively useful yields. The reagent is significantly more reactive than elemental bromine, and it is believed that bromine monoxide, formed insitu by the interaction of bromine and mercury oxide, is the reactive intermediate. Bromination by bromine monoxide is a free radical chain process in which hydrogen abstraction is carried out predominantly by bromoxy (BrO•) radicals, and to a lesser extent by bromine atoms.

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