Cd<sup>2+</sup>-Catalyzed Methanolysis of Phenyl Phosphatosulfate. Selectivity of Metal Ion in the Site of Cleavage of P–O and S–O Bond
作者:Toshio Eiki、Shin-ichi Negishi、Waichiro Tagaki、Mitsunori Izumi、Kazuhiko Ichikawa
DOI:10.1246/bcsj.65.3335
日期:1992.12
It was reported previously that metal ions such as Mg2+, Cr3+, Cu2+, Mn2+, and Ca2+ catalyzed selective P–O bond cleavage of P–O–S linkage in the methanolysis of phenyl phosphatosulfate (PPS), and in contrast, metal ions such as Zn2+, Fe3+, Al3+, and Be2+ promoted selective S–O bond cleavage.1) We have now found that Cd2+ catalyzes mixed cleavage of P–O and S–O bond in a ratio of 58 and 42%, respectively
之前有报道称,在苯磷酸硫酸酯 (PPS) 的甲醇分解中,Mg2+、Cr3+、Cu2+、Mn2+ 和 Ca2+ 等金属离子催化 P-O-S 键的选择性 P-O 键断裂,相反,金属离子如因为 Zn2+、Fe3+、Al3+ 和 Be2+ 促进选择性 S-O 键断裂。1) 我们现在发现 Cd2+ 催化 P-O 和 S-O 键的混合断裂,比例分别为 58% 和 42%,在PPS 的甲醇分解。Cd2+催化的P-O键断裂的二级速率常数(k2)满足k2(P-O)值与金属离子离子半径的相关性,而Cd2+催化的S-O键断裂的二级速率常数(k2)为远小于速率相关性的预期。氯离子的存在将 Cd2+ 催化的 P-O 键断裂的速率降低到没有氯离子时的约十分之一,但完全抑制了 Cd2+ 或 Zn2+ 催化的 S-O 键断裂。动力学研究表明氯离子的抑制作用发生在...