Concerted aminolysis of diaryl carbonates: Kinetic sensitivity on the basicity of the nucleophile, nonleaving group, and nucleofuge
作者:Enrique A. Castro、María Cubillos、Rocío Iglesias、José G. Santos
DOI:10.1002/kin.20700
日期:2012.9
(βN) in the range of 0.69–0.78 and 0.45–0.48, respectively, attributed to a concerted mechanism. The negative values found for the sensitivity of log kN to the basicity of the nonleaving (βnlg) and leaving (βlg) groups are discussed. Anilines are more reactive than isobasic SA amines, probably because of the greater steric hindrance offered by the latter. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet
4-甲基苯基,苯基和4-氯苯基-2,4,6-三硝基苯碳酸酯(的反应的动力学1,2,和3,分别地)与一系列苯胺和仲脂环族(SA)的胺已经进行了用分光光度法在44重量%的乙醇-水,在25.0℃下,离子强度0.2 M的布朗斯台德图(统计学校正)为碳酸盐的反应中1 - 3与苯胺和SA胺是线性的与斜率(β ñ在的范围内)分别归因于协调机制,分别为0.69–0.78和0.45–0.48。对于log k N对非离开的碱性(βNLG)和离开(β LG)基团进行了讨论。苯胺比等压SA胺更具反应性,这可能是由于后者提供的更大的位阻。©2012 Wiley Periodicals,Inc.国际化学杂志Kinet 44:604–611,2012