A series of pyrroles substituted with various electron-withdrawing groups (EWGs) on the N atom have been synthesized and full characterization including X-ray crystal structures obtained. Analysis of (13)C chemical shifts and X-ray crystal structures reveals that a trend between decreased aromaticity and the strength of the EWG exists. Experimental results regarding alternative mechanisms of nucleophilic
已经合成了一系列在N原子上被各种吸电子基团(EWG)取代的
吡咯,并获得了包括X射线晶体结构在内的完整特征。对(13)C
化学位移和X射线晶体结构的分析表明,芳香性降低与EWG强度之间存在趋势。因此可以合理化有关亲核取代反应的替代机制的实验结果。