m-Chloroperbenzoic acid → 3-Chlorobenzoic Acid

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Reaction Steps

Compounds of Formula Ib, where R=SOCH(R2)A can be prepared from the appropriate compounds of Formula Ia wherein R=SCH(R2)A by oxidation with m-chloroperoxybenzoic acid as shown in Equation 12. The reaction can be carried out by stirring equivalent amounts of Ia with m-chloroperoxybenzoic acid (MCPBA) in an inert solvent such as chloroform at 0° to reflux for 12-24 hours. The insoluble m-chlorobenzoic acid produced is removed by filtration and the chloroform solution is concentrated to yield the crude product. Purification by standard techniques will give the desired product. Oxidation of Ia with one equivalent of hydrogen peroxide in acetic acid at room temperature will also give the sulfoxides Ib. ##STR35##

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