Shen Yong-jia
2010
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Journal
Journal of East China University of Science and Technology
Abstract
Dimethyl 3,4-dioxylthiophene-2,5-dicarboxylate reacted with epibromohydrin in N,N-dimethylformamide(DMF)/triethylamine to afford dimethyl 2-(hydroxymethyl)-2,3-dihydrothieno-1,4-dioxine-5,7-dicarboxylate,which was saponified in aqueous KOH to form dimethyl(2-(hydroxymethyl)-)2,3-dihydrothieno -1,4dioxine-5,7-dicarboxylic acid.After decarboxylation in triethanolamine,3,4-hydroxymethyl-ethylenedioxythiophene was obtained,which is a mixture of 2,3-dihydrothieno-1,4-dioxin-2-yl methanol and 3,4-dihydro-2H-thieno-1,4-dioxepin-3-ol and their ratio was 6∶1.