作者:Charles B. Grissom、W. W. Cleland
DOI:10.1021/ja00278a036
日期:1986.9
The /sup 13/C isotope effect on the metal ion catalyzed decarboxylation of oxalacetate has been measured at 25/sup 0/C and pH 5.2: Mg/sup 2 +/, 1.0489; Mn/sup 2 +/, 1.0505; Ni/sup 2 +/, 1.044; Cd/sup 2 +/, 1.0492; Zn/sup 2 +/, 1.0504; Co/sup 2 +/, 1.0480. The transition state for decarboxylation appears not to change significantly with a change in divalent metal cation. A /sup 13/C isotope effect of 1
已在 25/sup 0/C 和 pH 5.2 下测量 /sup 13/C 同位素对金属离子催化的草酰乙酸脱羧的影响:Mg/sup 2 +/,1.0489;Mn/sup 2 +/,1.0505;Ni/sup 2 +/,1.044;Cd/sup 2 +/, 1.0492; Zn/sup 2 +/,1.0504;Co/sup 2 +/,1.0480。脱羧的过渡态似乎不会随着二价金属阳离子的变化而显着变化。对于单阴离子草酰乙酸盐的非金属催化脱羧,观察到 1.038 的 /sup 13/C 同位素效应,表明比金属离子催化反应更早的过渡态。