2-(4-Morpholino)thiobenzothiazole → 2-Morpholinosulphinyl-benzothiazole

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37.8 parts of 2-morpholinosulphenyl-benzothiazole are suspended in 65 parts of water containing 5 parts of sodium carbonate and 1 part of sodium bicarbonate. 90 parts by volume of an aqueous solution of sodium hypochlorite titrating 177 g. of NaClO and 3 g. of free caustic soda per liter are slowly introduced in a period of one hour into the well stirred suspension. The temperature is maintained at 25° C. and the mixture is stirred for 20 hours at this temperature. It is filtered, the solid is washed until neutral and dried under vacuum. 37 parts of 2-morpholinosulphinyl-benzothiazole melting at 93°-94° C. are obtained, that is a yield of 93%. On recrystallisation from a benzene/petrol ether mixture, the melting point is 99° C. (uncorrected).

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