Comparison of the partition between polar and SET pathways in the SRN1 mechanism for the nitronate and diethyldithiocarbamate anions. An unexpected result
Competition between SRN1 and SN2 mechanisms is discussed according to the stereochemical results in the alkylation of two anions by optically active α-chloroparanitrophenylethane1. In the reaction of 1 with the ambident anion of 2-nitropropane 2, competing SRN1 and SN2 processes take place, giving C-alkylation 3 with complete racemization and O-alkylation 4 products respectively. On the other hand
根据立体化学结果讨论了旋光性α-氯对硝基苯基乙烷1使两个阴离子发生烷基化的立体化学结果,讨论了S RN 1和S N 2机理之间的竞争。在1与2-硝基丙烷2的环境阴离子的反应中,发生竞争性S RN 1和S N 2的过程,分别得到具有完全外消旋化作用的C-烷基化3和O-烷基化4的产物。另一方面,二乙基二硫代氨基甲酸酯阴离子5被卤化物1的S-烷基化也涉及S RN1-S N 2竞争给出了相同的产物6,表明S RN 1途径参与的重要性较低,尽管事实上二硫代氨基甲酸酯比亚硝酸盐是更好的还原剂。