Hydrogen Peroxide → 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide 3-oxide

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bringing together the 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide and hydrogen peroxide under basic conditions, in the presence of a catalytic quantity of a suitable heavy metal compound oxidation catalyst effective of catalyze the oxidation of said 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide by the said hydrogen peroxide, in a liquid medium comprising water, or water plus at least one nonprotic organic liquid selected from the group consisting of (a) aromatic hydrocarbon solvent having a boiling point not greater than 145° C., (b) chlorinated hydrocarbon solvent having a boiling point not greater than 130° C., and, (c) a solvent having a boiling point not greater than 130° C. which is an alkyl ester of an aliphatic carboxylic acid, and subjecting the resulting mixture while agitating to a temperature of from 0° to 25° C., whereby 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide 3-oxide is formed;

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