C. Jing
2011
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Journal
Chemical Reagents
Abstract
3,4-Dimethylthieno[2,3-b]thiophene-2,5-dicarboxylate was prepared from acetylacetone and carbon disulfide,then it reacted with excess of hydrazine in different solvent to form various products:refluxing in ethanol for 24 h gave monoacylhydrazine product ethyl 5-(hydrazinecarbonyl) 3,4-dimethylthieno[2,3-b]thiophene-2-carboxylate in 66% yield;howbeit diacylhydrazine product 3,4-dimethylthieno [2,3-b]thiophene-2,5-dicarbohydrazide was obtained with DMF as solvent in the reaction and gave 68% yield.