A Kinetic Study on the Pairwise Competition Reaction of α-Diazo Esters with Rhodium(II) Catalysts: Implication for the Mechanism of Rh(II)-Carbene Transfer
作者:Zhaohui Qu、Weifeng Shi、Jianbo Wang
DOI:10.1021/jo0107352
日期:2001.11.1
further subjected to Hammett correlation analysis and were found to have better linear correlation with sigma(+). Reaction constants for four Rh(II) catalysts have been obtained, Rh(2)(OAc)(4) (rho = -1.29 with sigma(+), r = -0.99), Rh(2)(Ooct)(4) (rho = -1.31 with sigma(+), r = -0.99), Rh(2)(acam)(4) (rho = -1.18 with sigma(+), r = -0.99), Rh(2)(O(2)CCF(3))(4) (rho = -1.46 with sigma(+), r = -0.99). The
通过分子间竞争来测量一系列对位或间位取代的重氮苯基乙酸酯的Rh(II)介导的重氮分解的相对速率常数。进一步对动力学数据进行Hammett相关分析,发现与sigma(+)的线性相关性更好。已获得四种Rh(II)催化剂的反应常数,Rh(2)(OAc)(4)(rho = -1.29,sigma(+),r = -0.99),Rh(2)(Ooct)(4) (rho = -1.31,sigma(+),r = -0.99),Rh(2)(acam)(4)(rho = -1.18,sigma(+),r = -0.99),Rh(2)(O (2)CCF(3))(4)(rho = -1.46,sigma(+),r = -0.99)。讨论了这些数据的机械含义。