Comparison of the partition between polar and SET pathways in the SRN1 mechanism for the nitronate and diethyldithiocarbamate anions. An unexpected result
作者:K.El Badraoui、M. Chanon、D. Merlet、K. Chajara、J. Courtieu
DOI:10.1016/s0040-4039(96)02443-4
日期:1997.2
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。