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| 1-Ethoxyethylidenemalononitrile was found to react with hydrogen sulfide to give different products depending on the solvent used. When benzene was the solvent, 2-cyano-3-ethoxy- thiocrotonamide was the product. When ethyl alcohol was the solvent, 2-cyanothioacetamide and ethyl thionoacetate were found. A possible mechanism accounting for the products obtained when ethyl alcohol was used as the solvent is that 2-cyano-3-ethoxythiocrotonamide is first formed, and it then reacts with excess hydrogen sulfide to form 2-cyanothioacetamide and ethyl thionoacetate. 2-Cyano-3-ethoxythiocrotonamide is so slightly soluble in benzene that it precipitates before it can react with the hydrogen sulfide. Several 2-cyano-3-alkoxy- 2-alkenthioamides were prepared and their reactions were studied. The alkoxy group of these compounds was easily removed by mild hydrolysis to produce 2-cyano-3-hydroxy-2 -alkenthioamides. The alkoxy group was also replaced by amines and ammonia. Mild oxidation of 2-cyano-3-hydroxythiocrotonamide with iodine in potassium iodide gave 3,3'-dithiobis [2-(l-hydroxyethylidene)-3-iminopropionitrile]. Surprisingly, this same product was also obtained when 2-cyano-3-ethoxythiocrotonamide was treated with iodine in potassium iodide under the same conditions. |
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