Effects ofortho- andpara-Ring Activation on the Kinetics of SNAr Reactions of 1-Chloro-2-nitro- and 1-Phenoxy-2-nitrobenzenes with Aliphatic Amines in Acetonitrile
作者:Michael R. Crampton、Thomas A. Emokpae、Chukwuemeka Isanbor、Andrei S. Batsanov、Judith A. K. Howard、Raju Mondal
DOI:10.1002/ejoc.200500774
日期:2006.3
Rate constants are reported for reaction of 4-substituted 1-chloro-2,6-dinitrobenzenes 1, 6-substituted 1-chloro-2,4-dinitrobenzenes 2, and some of the corresponding 1-phenoxy derivatives, 3 and 4, with n-butylamine, pyrrolidine and piperidine in acetonitrile as solvent. Values of k1, the rate constant for nucleophilic attack at the 1-position, increase with increasing ring-activation but may be reduced
报告了 4-取代的 1-氯-2,6-二硝基苯 1、6-取代的 1-氯-2,4-二硝基苯 2 和一些相应的 1-苯氧基衍生物 3 和 4 与正丁胺、吡咯烷和哌啶在乙腈中作为溶剂。k1 的值,即 1 位亲核攻击的速率常数,随着环活化的增加而增加,但可能会因反应中心的空间排斥而降低,其增加顺序为 Cl 吡咯烷 > 哌啶。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)