[OH-].[Na+].[SH:3][CH2:4][CH2:5][CH2:6][NH:7][C:8](=[O:10])[CH3:9].[Cl:11][C:12](Cl)=[CH:13][N+:14]([O-:16])=[O:15].Cl.[Cl-].[Na+]>CO>[Cl:11][C:12]([S:3][CH2:4][CH2:5][CH2:6][NH:7][C:8](=[O:10])[CH3:9])=[CH:13][N+:14]([O-:16])=[O:15]A solution of 0.12 g of sodium hydroxide in 5 ml of methanol was added over 10 minutes to a solution of 0.40 g of 1 in 5 ml of methanol. Then a solution of 0.95 g of 1,1-dichloro-2-nitroethene (13A) in 5 ml of methanol was added over 20 minutes, at 0° C. The mixture then was stirred for 20 minutes and poured into 2% hydrochloric acid saturated with sodium chloride. The resulting mixture was extracted with methylene chloride, the solvent was evaporated and the residue was purified over silica gel to give 13, as an oil.
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