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Subject - Inorganic Chemistry, Organic Chemistry

Saline peroxides contain O22-anions. The most important are the peroxides of the alkali and alkaline earth metals. (Examples: Na2O2, BaO2). These compounds tend to explode by contact with organic materials. With water they decompose generating hydrogen peroxide HOOH.

In peroxo complexes, O22 acts as a ligand. These are dioxometal cyclic compounds, i.e. three-membered rings containing two oxygen and one metal atom as well as multicycle complexes bridged by -O-O-.

Covalently bound peroxides have the general formula X-O-O-Y and easily decompose into radicals. Aqueous solutions of hydrogen peroxide are being used as bleaching or oxidizing agent. ClOOCl is a key factor in ozone depletion of stratospheric ice clouds (ozone hole process). Organic peroxides, such as di-tert-butylperoxide (CH3)3C-O-O-C(CH3)3 and dibenzoylperoxide C6H5-CO-O-O-CO-C6H5 are used as initiators in radical polymerizations. Peroxides are unwanted by-poducts during the autoxidation of organic compounds.