Rate-determining nitrogen inversion in the isomerisation of isoimides to imides and azides to tetrazoles: direct observation of intermediates stabilized by trifluoroethyl groups
作者:Anthony F. Hegarty、Nuala M. Tynan、Suzanne Fergus
DOI:10.1039/b202005j
日期:2002.6.27
N→O acylgroup transfer or cyclisation. The Hammett ρ value (−0.4), obtained for the rearrangement of the imidoyl azides to the tetrazoles, compares well to other systems where the rate-determining step (nitrogen inversion) was similar. Nitrogen inversion in these imine systems is therefore significantly slower (ca. 10-fold relative to an ethyl group) in the presence of the trifluoroethyl group on nitrogen