作者:Toshio Shimizu、Yusuke Nakashima、Itaru Watanabe、Kazunori Hirabayashi、Nobumasa Kamigata
DOI:10.1039/b206859c
日期:2002.10.1
racemized seleninic acids. Optically active seleninic acids with low-acidity were more stable against racemization than those with high-acidity. The bulky substituents at the ortho position on the benzene ring of the areneseleninic acids were also found to be effective for retarding the racemization. The mechanism for the racemization was clarified to proceed via seleninate anion with the extrusion of a
各种旋光性芳烯硒酸(ArSeO 2 H; Ar = 4-Me-C 6 H 4 ; 4-MeO-C 6 H 4 ; 2-MeO-C 6 H 4 ; 2-MeOCO-C 6 H 4 ; 2, 4,6-Me 3 -C 6 H 2 ; 2,4,6-Et 3 -C 6 H 2 ; 2,4,6- i Pr 3 -C 6 H 2 ; 2,4,6- t Bu 3 -C 6 H 2; 2,4- t Bu 2 -6-MeO-C通过使用中压在手性柱上通过光学拆分获得溶液形式的6 H 2)液相色谱。洗脱液的浓度蒸发在减压下产生完全消旋的硒化亚硒酸。具有低酸度的旋光硒酸比具有高酸度的硒酸对消旋更稳定。在所述大体积取代基的邻位上的位置苯环还发现芳族硒酸中的一部分可有效延缓外消旋作用。明确了消旋作用的机理是通过硒酸根阴离子的挤出来进行的。质子 在稀薄条件下。