Ethanone, 1-[4-fluoro-2-(methylamino)phenyl]-2-(methylsulfinyl)- → 1-(4-Fluoro-2-methylaminophenyl)-2-(methylthio)ethanone

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A mixture of 1-(4-fluoro-2-methylaminophenyl)-2-methylsulphinylethanone (100 g), prepared in a similar manner to that described in Example 1, sodium hydrogen sulphite (1 kg) and water (2.5 1) was stirred under nitrogen and heated at 90°-105° for 3 hours. The mixture was allowed to cool and then stood at ambient temperature for 72 hours. The mixture was extracted with dichloromethane (3×250 ml) and the combined extracts evaporated to give a solid product. Crystallisation from hexane gave 1-(4-fluoro-2-methylaminophenyl)-2-(methylthio)ethanone, m.p. 61.5°-63°.

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