科研之友
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摘要
Although one of the first 2D NMR methods, but so far neglected, selective J-resolved NMR spectroscopy offers a unique opportunity to help organic chemists in structure elucidation, avoiding natural and nonnatural product misassignments. This NMR method indeed allowed us to unambiguously and simply assign (natural) product structures exhibiting trisubstituted unsaturations. For example, as demonstrated here, the isomeric aurone, flavone, coumarin and isocoumarin structures could easily be distinguished; regioisomer assignments in furans could be solved, as well as isomerisms in compounds containing trisubstituted double-bonds (aurones, lactones, divinyl ketones).
- 出版日期2015
