Abstract The title compound Vb affords with piperidine normal nucleophilic substitution product and the isomeric 3-piperidino derivative XXXII. The structure of XXXII was proven by (1) the 1 H NMR and 13 C NMR spectra,(2) an independent synthesis via the intermediates XXXV, XXXVI, XXX, IV and VIIIa, and (3) with the help of model reactions of the 2-methyl derivative VIb and the 3-methyl derivative VIIb with piperidine. The rearranged cation ...