Published on 01 January 1988. Downloaded by google on 23/02/2016 14:28:54. ... View Article Online / Journal Homepage / Table of Contents for this issue ... I I I I 7 I I I I 1 I ... I 1 I I ' I I -1 I , . , I \ ... Figure 1. 15N Nmr spectra taken at about one half-life during the rearrangement of compounds (1) and (2) in the presence of a standard (S, C6H515N02): (a), the uncatalysed rearrangement of (1) at 34°C; (b), the acid catalysed rearrangement of (1) at 23.1"C; (d), the uncatalysed ...