Résumé : The 2‐ and 4‐chloro derivatives of pyridine, pyridine‐N oxyde and nitrobenzene have been reacted with molar piperidine in methanol. The results suggest an increased built‐in solvation in the case of 2‐chloropyridine‐N oxyde, and favour the electrostatic interpretation for this particular interaction. The “meta” substituted chlorides have almost identical reactivities; this points to the similarities of the inductive effects for the three activating groups. Copyright © 1963 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim