Methanolysis of Thioamide Promoted by a Simple Palladacycle Is Accelerated by 10<sup>8</sup> over the Methoxide-Catalyzed Reaction
作者:C. Tony Liu、Christopher I. Maxwell、Stephanie G. Pipe、Alexei A. Neverov、Nicholas J. Mosey、R. Stan Brown
DOI:10.1021/ja209605r
日期:2011.12.21
N-methyl-N-(4-nitrophenyl)thiobenzamide (4) via a mechanism involving formation of a Pd-bound tetrahedral intermediate (TI). The rate constant for decomposition of the complex formed between 1, methoxide, and 4 is 9.3 s(-1) at 25 °C; this reaction produces methyl thiobenzoate and N-methyl-4-nitroaniline. The ratio of the second-order rate constant for the catalyzed reaction, given as k(cat)/K(d), relative to
Palladacycle 1 催化 N-甲基-N-(4-硝基苯基) 硫代苯甲酰胺 (4) 的甲醇裂解,其机制涉及形成 Pd 结合的四面体中间体 (TI)。1、甲醇盐和 4 之间形成的配合物的分解速率常数在 25 °C 时为 9.3 s(-1);该反应生成硫代苯甲酸甲酯和 N-甲基-4-硝基苯胺。催化反应的二级速率常数(以 k(cat)/K(d) 表示)与甲醇促进反应的二级速率常数之比为 3 × 10(8),代表硫代酰胺的非常大的催化作用通过合成金属络合物进行键断裂。