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

摘要

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 (kobs) for the deuterium exchange in CD3OD is determined by1H NMR method, and the value of kobs 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.