Photocatalytic Reactions Involving Radical Chain Reactions Using Microelectrodes†

1997 ◽  
Vol 101 (14) ◽  
pp. 2617-2620 ◽  
Author(s):  
Katsuyoshi Ikeda ◽  
Hideki Sakai ◽  
Ryo Baba ◽  
Kazuhito Hashimoto ◽  
Akira Fujishima
Keyword(s):  
Radical Chain ◽  
Chain Reactions ◽  
Photocatalytic Reactions

scholarly journals On the mechanism of photocatalytic reactions with eosin Y

2014 ◽  
Vol 10 ◽  
pp. 981-989 ◽  
Author(s):  
Michal Majek ◽  
Fabiana Filace ◽  
Axel Jacobi von Wangelin
Keyword(s):  
Solvent Polarity ◽  
Quantum Yields ◽  
Eosin Y ◽  
Acid Base ◽  
Absorption Properties ◽  
Direct Photolysis ◽  
Radical Chain ◽  
Chain Reactions ◽  
Photocatalytic Reactions

A combined spectroscopic, synthetic, and apparative study has allowed a more detailed mechanistic rationalization of several recently reported eosin Y-catalyzed aromatic substitutions at arenediazonium salts. The operation of rapid acid–base equilibria, direct photolysis pathways, and radical chain reactions has been discussed on the basis of pH, solvent polarity, lamp type, absorption properties, and quantum yields. Determination of the latter proved to be an especially valuable tool for the distinction between radical chain and photocatalytic reactions.

ChemInform Abstract: Concise Syntheses of L-Selenomethionine and of L-Selenocystine Using Radical Chain Reactions.

ChemInform ◽  
1987 ◽  
Vol 18 (4) ◽  
Author(s):  
D. H. R. BARTON ◽  
D. BRIDON ◽  
Y. HERVE ◽  
P. POTIER ◽  
J. THIERRY ◽  
...  
Keyword(s):  
Radical Chain ◽  
Chain Reactions

scholarly journals The detection and inhibition of free radical chain reactions

1942 ◽  
Vol 180 (982) ◽  
pp. 237-256 ◽  
Keyword(s):  
Nitric Oxide ◽  
Free Radical ◽  
Chemical Analysis ◽  
Diethyl Ether ◽  
Pressure Increase ◽  
Stationary States ◽  
Decomposition Rates ◽  
Radical Chain ◽  
Chain Reactions ◽  
Limiting Values

Part I. Comparison of nitric oxide and propylene as inhibitors The reduction by propylene of the rate of pressure increase in the decomposition of propaldehyde at 550° has been shown by chemical analysis to represent a true inhibition of the reaction, and not to be due n an important degree to an induced polymerization of the propylene. With propaldehyde and with diethyl ether the limiting values to which the decomposition rates are reduced by nitric oxide and by propylene respectively are the same, although much more propylene is required to produce a given degree of inhibition. From this it is concluded that the limiting rates are more probably those of independent non-chain processes, than those characteristic of stationary states where the inhibitor starts and stops chains with equal efficiency.

Dithiocarbonate group transfer in radical chain reactions

1990 ◽  
Vol 31 (18) ◽  
pp. 2565-2568 ◽  
Author(s):  
Judith E. Forbes ◽  
Catherine Tailhan ◽  
Samir Z. Zard
Keyword(s):  
Radical Chain ◽  
Group Transfer ◽  
Chain Reactions

Resonance-stabilized hydrocarbon-radical chain reactions may explain soot inception and growth

Science ◽  
2018 ◽  
Vol 361 (6406) ◽  
pp. 997-1000 ◽  
Author(s):  
K. O. Johansson ◽  
M. P. Head-Gordon ◽  
P. E. Schrader ◽  
K. R. Wilson ◽  
H. A. Michelsen
Keyword(s):  
Interstellar Dust ◽  
Hydrogen Abstraction ◽  
Particle Formation ◽  
Reaction Pathways ◽  
Radical Chain ◽  
Carbonaceous Particle ◽  
Carbonaceous Particles ◽  
Chain Reactions ◽  
Polycyclic Aromatic ◽  
Covalently Bound

Mystery surrounds the transition from gas-phase hydrocarbon precursors to terrestrial soot and interstellar dust, which are carbonaceous particles formed under similar conditions. Although polycyclic aromatic hydrocarbons (PAHs) are known precursors to high-temperature carbonaceous-particle formation, the molecular pathways that initiate particle formation are unknown. We present experimental and theoretical evidence for rapid molecular clustering–reaction pathways involving radicals with extended conjugation. These radicals react with other hydrocarbon species to form covalently bound complexes that promote further growth and clustering by regenerating resonance-stabilized radicals through low-barrier hydrogen-abstraction and hydrogen-ejection reactions. Such radical–chain reaction pathways may lead to covalently bound clusters of PAHs and other hydrocarbons that would otherwise be too small to condense at high temperatures, thus providing the key mechanistic steps for rapid particle formation and surface growth by hydrocarbon chemisorption.

Radical Chain Reactions: Organoborane Initiators

2008 ◽  
pp. 11-27 ◽  
Author(s):  
Hideki Yorimitsu ◽  
Koichiro Oshima
Keyword(s):  
Radical Chain ◽  
Chain Reactions
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