mercuric acetate in tetrahydrofuran to give arylmercuric acetates and triethyltin acetate. Relative rates of aryl-tin cleavage in these compounds, obtained by competition reactions at 20°, are as follows: p-CH3O, 8.30; p-CH3, 1.76; p-Cl, 0.25; H, 1.00; m-CH3, 1.21; m-CH3O, 0.72; m-Cl, 0.029. Substituent effects are fairly related to the Hammett equation, log kX/kH = −3.5 σ. The results indicate that the
芳基
三乙基锡化合物XC 6 H 4 SnEt 3与
乙酸汞在
四氢呋喃中反应,得到
乙酸芳基
汞和
乙酸三乙基锡。通过在20°下的竞争反应获得的这些化合物中的芳基-
锡裂解的相对速率如下:p -CH 3 O,8.30;m- CH 3 O,8.30。p -CH 3,1.76; p -Cl,0.25;m / z。H,1.00; H,1.00。米-CH 3,1.21; m -CH 3 O,0.72;m -CH 3 O,0.72。m -Cl,0.029。取代基效应与Hammett方程相当相关,log k X / k H= -3.5σ。结果表明,该反应是亲电取代物,其中
苯甲酸铵离子型中间体不参与速率确定步骤。