The applicability of the Hammettequation to the effective ionization constants of tautomeric substances has been investigated. The tautomeric equilibrium being shifted toward one of the forms, a good linear dependence of pKA on σ is observed. When at particular σ values the second tautomeric form makes its appearance in the equilibrium to a noticeable extent one observes the deviation from linearity
已经研究了Hammett方程对互变异构物质的有效电离常数的适用性。互变异构平衡向一种形式转移,观察到p K A对σ具有良好的线性依赖性。当第二互变异构体形式处于特定的σ值时,它在平衡中的出现达到了显着的程度,即观察到了与线性度的偏差。可以看出它与平衡形式的增加平行。互变异构平衡常数通过简单的相关关系K T = K 1 / K 2 = 10 a与线性度' a '的偏差相关。-1从而确定了特定形式的电离常数,互变异构物质的有效电离常数和σ值之间的定量关系。
Gold-catalyzed alkenylation and arylation of phosphorothioates
作者:Urvashi、Sampoorna Mishra、Nitin T. Patil
DOI:10.1039/d3sc04888h
日期:——
Reported herein is the ligand-enabled gold-catalyzed alkenylation and arylation of phosphorothioates using alkenyl and aryl iodides. Mechanistic studies revealed a crucial role of the in situ generated Ag–sulfur complex, which undergoes a facile transmetalation with the Au(III) intermediate, thereby leading to the successful realization of the present reaction. Moreover, for the first time, the alkenylation