Demonstration of Prominent Cu(II)-Promoted Leaving Group Stabilization of the Cleavage of a Homologous Set of Phosphate Mono-, Di-, and Triesters in Methanol
作者:C. Tony Liu、Alexei A. Neverov、Christopher I. Maxwell、R. Stan Brown
DOI:10.1021/ja910111q
日期:2010.3.17
phosphate mono-, di-, and triesters with a common leaving group (LG) (2'-(2-phenoxy)-1,10-phenanthroline) was prepared, and the kinetics of decomposition of their Cu(II) complexes was studied in methanol at 25 degrees C under (s)(s)pH-controlled conditions. The Cu(II) complexes of 2-[2'-phenanthrolyl]phenyl phosphate (Cu(II):6), 2-[2'-phenanthrolyl]phenyl methyl phosphate (Cu(II):7), and 2-[2'-phenanthrolyl]phenyl
制备了一系列具有公共离去基团 (LG) (2'-(2-苯氧基)-1,10-菲咯啉) 的磷酸单酯、二酯和三酯,并对其 Cu(II) 的分解动力学进行了研究在 (s)(s) pH 控制条件下,在 25 摄氏度的甲醇中研究了复合物。2-[2'-菲咯基]苯基磷酸酯 (Cu(II):6)、2-[2'-菲咯基]苯基甲基磷酸酯 (Cu(II):7) 和 2-[ 2'-菲咯基]苯基磷酸二甲酯 (Cu(II):8) 紧密结合,解离常数 Kd < 或 = 3 x 10(-7) M,Cu(II) 与离开的酚盐接触。Cu(II):6 裂解的 (s)(s)pH/速率曲线具有低 (s)(s)pH 平台 (k(o) = 6.3 x 10(-3) s(-1)) ,然后是一个钟形最大值 (kcat(max) = 14.7 +/- 0.4 s(-1)) 取决于两个电离,具有 (s)(s)pKa(2) 和 (s)(s)pKa(3)