Kinetic and Mechanistic Study of the Pt(II) versus Pt(IV) Effect in the Platinum-Mediated Nitrile−Hydroxylamine Coupling
作者:Konstantin V. Luzyanin、Vadim Yu. Kukushkin、Alexander D. Ryabov、Matti Haukka、Armando J. L. Pombeiro
DOI:10.1021/ic048388c
日期:2005.4.1
and trans-1; Et, cis-2 and trans-2; CH(2)Ph, cis-3 and trans-3; CH(2)C(6)H(4)Cl-p, cis-4 and trans-4; n = 4, R = Me, trans-9; Et, trans-10; CH(2)Ph, trans-11; CH(2)C(6)H(4)Cl-p, trans-12) or [Ph(3)PCH(2)Ph][PtCl(n)NH=C(Et)ONR(2)}] (n = 3, R = Me, 5; Et, 6; CH(2)Ph, 7; CH(2)C(6)H(4)Cl-p, 8; n = 5, R = Me, 13; Et, 14; CH(2)Ph, 15; CH(2)C(6)H(4)Cl-p, 16) in excellent to good (95-80%) isolated yields. The
16)优良至优良(95-80%)的分离产率。Pt(IV)配合物9-16与叶立德Ph(3)P = CHCO(2)Me的还原可以合成Pt(II)物种1-8。通过元素分析(C,H,N),FAB-MS,IR,(1)H,(13)C (1)H}和(31)P (1)H } NMR(后者用于阴离子型络合物5-8和13-16),并通过X射线晶体学测定Pt(II)(顺式1,顺式2和反式4)和Pt(IV)( 15)种。向复合物[Ph(3)PCH(2)Ph] [Pt(II)Cl(3)添加R(2)NOH(R = CH(2)C(6)H(4)Cl-p)的动力学研究)(EtCN)]和[Ph(3)PCH(2)Ph] [Pt(IV)Cl(5)(EtCN)]通过(1)H NMR技术显示,两个反应都是(p-ClC (6)H(4)CH(2))(2)NOH和Pt(II)或Pt(IV)络合物,对于Pt(IV),二阶速率常数k(