The invention relates to novel ketone peroxides compositions containing them and processes for producing the peroxides and the compositions. The ketone peroxides are those with an alkoxy or hydroxy substituent in the alpha , beta - or gamma -position. The compositions contain (1) the peroxides and (2) water which may be in admixture with a hydrophobic or hydrophilic solvent or (3) a hydrophobic solvent. The peroxides are produced by reacting the alpha , beta - or gamma -alkoxy or hydroxy ketone with aqueous hydrogen peroxide and a source of hydrogen ions, for example a mineral acid.
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