Calculation of the rate constant for the reaction of atomic hydrogen with molecular oxygen to form the free radical HO2

1980 ◽  
Vol 73 (2) ◽  
pp. 765-769 ◽  
Author(s):  
Richard J. Blint
Keyword(s):  
Free Radical ◽  
Molecular Oxygen ◽  
Rate Constant ◽  
Atomic Hydrogen

Direct Dynamics for Free Radical Kinetics in Solution:  Solvent Effect on the Rate Constant for the Reaction of Methanol with Atomic Hydrogen

1999 ◽  
Vol 103 (25) ◽  
pp. 4893-4909 ◽  
Author(s):  
Yao-Yuan Chuang ◽  
Mala L. Radhakrishnan ◽  
Patton L. Fast ◽  
Christopher J. Cramer ◽  
Donald G. Truhlar
Keyword(s):  
Free Radical ◽  
Solvent Effect ◽  
Rate Constant ◽  
Atomic Hydrogen ◽  
Direct Dynamics

Manganese(III)-based oxidative free-radical reaction of α-allyl-β-keto ester with molecular oxygen

1993 ◽  
Vol 34 (52) ◽  
pp. 8509-8512 ◽  
Author(s):  
Takashi Ohshima ◽  
Mikiko Sodeoka ◽  
Masakatsu Shibasaki
Keyword(s):  
Free Radical ◽  
Molecular Oxygen ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Keto Ester

The Reaction of S(3P) Atoms with Molecular Oxygen

1971 ◽  
Vol 49 (10) ◽  
pp. 1659-1664 ◽  
Author(s):  
R. W. Fair ◽  
A. Van Roodselaar ◽  
O. P. Strausz
Keyword(s):  
Molecular Oxygen ◽  
Rate Constant ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Flash Photolysis ◽  
Ultraviolet Region ◽  
Kinetic Spectroscopy ◽  
Vacuum Ultraviolet Region

The rate constant of the reaction of ground state S(3P) atoms with molecular oxygen, S(3P) + O2(X3Σg−) → SO(X3Σ−) + O(3P), has been determined as (1.7 ± 0.2) × 1012 cm3 mol−s− at 298 °K by means of kinetic spectroscopy in the vacuum ultraviolet region. The source of S(3P) atoms was the isothermal flash photolysis of COS in the presence of Ar or CO2.

scholarly journals Free Radical Mediated Oxidative Degradation of Carotenes and Xanthophylls

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1038 ◽  
Author(s):  
Raphael C. Mordi ◽  
Olabisi T. Ademosun ◽  
Christiana O. Ajanaku ◽  
Ifedolapo O. Olanrewaju ◽  
John C. Walton
Keyword(s):  
Excited State ◽  
Free Radical ◽  
Vitamin A ◽  
Molecular Oxygen ◽  
Oxidative Degradation ◽  
Chain Structure ◽  
Ring Structure ◽  
Peroxyl Radicals ◽  
Chemical Structures ◽  
Excited State Quenching

This article reviews the excited-state quenching, pro-vitamin A activity and anticarcinogenicity of carotenes and xanthophylls in relation to their chemical structures. Excited-state quenching improved with the length of the conjugated chain structure. Pro-vitamin A activity was dependent on the presence of at least one beta-ionyl ring structure. The effectiveness of carotenoids as antioxidants depended on their ability to trap peroxyl radicals with production of resonance-stabilized carotenyl radicals. The products identified from oxidations of carotenes and xanthophylls with molecular oxygen and other oxidizing agents are presented. The free radical-mediated mechanisms that have been proposed to account for the different classes of products are reviewed.

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