[CH3:1][N:2]1S[C:6]2[CH2:8][CH2:9][CH2:10][C:5]=2[C:3]1=[O:4].[S:11]([S:14]([O-])=O)([O-])=O.[Na+].[Na+]>O>[CH3:1][NH:2][C:3]([C:5]1[CH2:10][CH2:9][CH2:8][C:6]=1[S:11][S:14][C:6]1[CH2:8][CH2:9][CH2:10][C:5]=1[C:3]([NH:2][CH3:1])=[O:4])=[O:4]2-methyl-4,5-trimethylene-4-isothiazolin-3-one (1 part) was stirred in distilled water (25 parts) at 20°-25° C. Sodium hydrosulphite (2×0.2 parts) was added in two portions over 30 minutes. Analysis by HPLC indicated the formation of two products.
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