将苯并咪唑-2-硫酮与乙炔二甲酸二甲酯(DMAD)在乙腈中混合,得到稠合的噻唑烷酮衍生物,但在甲醇中,得到了稠合的噻嗪酮。通过与这些化合物的13 C nmr光谱比较,将结构分配给其他硫脲的加合物。已开发出一种使用1 H和13 C nmr光谱技术来区分DMAD与胍和am衍生物的加合物可能的结构类型的方法。从各种硫代酰胺和DMAD的产物通过其核磁共振谱和其他光谱进行鉴定。
Structures of Addition Products of Acetylenedicarboxylic Acid Esters with Various Dinucleophiles. An application of C, H-spin-coupling constants
作者:Ulrich Vögeli、Wolfgang von Philipsborn、Kuppuswamy Nagarajan、Mohan D. Nair
DOI:10.1002/hlca.19780610207
日期:1978.3.8
Heterocyclic compounds obtained by addition of acetylenedicarboxylicacidesters to thioureas, cyclic amidines and o-difunctionalized aromatic systems have been studied by 13C-NMR. In particular, C, H-spin-coupling constants over two and three bonds were used to differentiate between the various constitutional isomers and to establish the configuration of trisubstituted exocyclic C, C-double bonds