Cui Yan-fang
2007
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Journal
Journal of Huazhong Normal University
Abstract
(E)-1,4-di(benzo)dioxol-5-yl)-2-(methylthio)but-2-ene-1,4-dione(A) and(Z)-1,4-di(benzo)dioxol-5-yl)-2-(methylthio)but-2-ene-1,4-dione(B) were two olefinic isomers products containing 1,4-dicarbonyl group synthesized by a noval and efficient carbon-carbon double-bond-forming reaction starting from 1-(benzodioxol-5-yl) ethanone via the self-sorting tandem reaction strategy.The complete 1H and 13C NMR assignments are reported for the two new 1,4-dicarbonyl derivatives.1D and 2D NMR experiments including 1H-1H correlation spectroscopy(COSY),1H-13C heteronuclear single quantum coherence(HSQC),heteronuclear multiple bond correlation(HMBC) and nuclear overhauser effect spectroscopy(NOESY) experiments were used for the assignments and determination of cis/trans-isomers of the two compounds.