Recombination, oxidative degradation

In the troposphere ozone is produced by photodissociation (equation 3) not of 02 but of N02, initiated with wavelengths <410 nm, followed by recombination (equation 2) with 02. In the upper troposphere and lower stratosphere the photolysis of ozone (equation 4) yields excited-state oxygen atoms which react with water to produce hydroxyl radicals (equation 5). These are crucial to the removal of organic compounds from the troposphere, since they readily abstract hydrogen atoms (equation 6) to yield organic radicals which subsequently undergo further oxidative degradation. 

Subsequent synthesis of Vitamin D metabolites involved oxidative degradation of the vitamin D molecule to obtain the C- and D-ring portion with the intact side chain. Recombination of this molecule with an appropriate stmcture containing the A-ring was then carried out by a Wittig-type... 

To understand oxidative degradation it is necessary to consider the factors that influence the overall process and to study their effects separately. This knowledge is then recombined into a comprehensive understanding of degradation in real systems. One important group of problems concerns reactions between the various components in homogeneous systems such as melts and solutions. A second important group of problems with which this chapter is concerned, is the effects of crystalline... 

Antibacterial, deodorizing and self-cleaning functions of photocatalyst derive from the organic compound decomposition ability of active oxygen, generated from photocatalytic reaction. For the purpose of improving oxidative degradation activity, it is essential to reduce the recombination of photo-excited electron-hole pair. 

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