Sodium Carbonate → 2-Benzothiazolesulfinamide, N,N-dimethyl-

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Reaction Steps

10 parts of sodium carbonate and 4 parts of sodium bicarbonate are added to a well stirred suspension of 63 parts 2-N,N-dimethylbenzothiazole-sulphenamide in 130 parts of water. 170 parts by volume of a solution of sodium hypochlorite titrating 177 g. of NaClO and 3 g. of free caustic soda per liter are then slowly introduced, in about 5 hours and keeping the temperature within the range from 25° C. to below 30° C. The excess of hypochlorite is controlled by starchiodide paper. After introduction, the mixture is stirred for a further hour. The creamy white precipitate obtained is filtered off, washed until the washings are neutral and dried at 60° C. The 2-N,N-dimethyl-benzothiazole-sulphinamide melting at 121°-122° C., free from dibenzothiazyl disulphide, is obtained with a yield of 90%.

Provenance & Evidence