α-proton deuterium exchange of five-coordinate bicycloazastannoxides catalyzed by Et_3N  

作　　者：杨晓萍 张殿坤 王积涛 

出　　处：《Science China Chemistry》1999年第5期458-462,共5页中国科学（化学英文版）

摘　　要：The five-coordinate bicycloazastannoxides (l-6) in the presence of Et3N has been investigated by 1H NMR spectrograph. It has been found that the deuterium exchange of αCH of five-coordinate bicycloazastannoxides with CD3OD takes place, which is catalyzed by Et3N. In the presence of Et3N (2 μL) , the apparent rate constants (κobs) forthe deuterium exchange in CD3OD is determined by H NMR method, and the value of κobs is in the range of (2.05-10.8)×10-4s-1.The effect of the substitutes on the rates and the kinetic mechanism are discussed.The five-coordinate bicycloazastannoxides （1—6） in the presence of Et₃N has been investigated by¹H NMR spectrograph. It has been found that the deuterium exchange of αCH of five-coordinate bicycloazastannoxides with CD₃OD takes place, which is catalyzed by Et₃N. In the presence of Et₃N （2μL）, the apparent rate constants (k_obs) for the deuterium exchange in CD₃OD is determined by¹H NMR method, and the value of k_obs is in the range of （2.05--10.8）×10^-4 s^-1. The effect of the substitutes on the rates and the kinetic mechanism are discussed.

关 键 词：five-coordinate bicycloazastannoxides DEUTERIUM exchange 

分 类 号：O643.3[理学—物理化学]