investigated by 13C and 17O NMR spectroscopy. The effects of substituents on the conformational equilibria of the seven‐membered rings are discussed and compared with those for six‐membered ring sulphites.
已通过 13C 和 17O NMR 光谱研究了一些甲基取代的 1,3,2-二氧杂
噻吨的立体异构现象。讨论了取代基对七元环构象平衡的影响,并与六元环
亚硫酸盐的影响进行了比较。