Étude de la substitution nucléophile aromatique. I. Cinétique de la réaction du dinitro-2,4 chlorobenzène et du chlorure de picryle avec les amines primaires et secondaires
In: Bulletin de la Classe des sciences, Band 56, Heft 1, S. 904-920
The reactivity of 2,4dinitro-chlorobenzene (DNCB) and of 2,4,6trinitro-chlorobenzene, or picryl chloride (PC), with various primary and secondary amines has been studied.
These reactions occur nearly quantitatively generating the corresponding dinitro-(DNA) or trinitro-anilines (TNA). They are governed by a second order law, V = k2[DNCB] [Amine] or V = k2[PC] [Amine], of which corresponding values of k2 has been determined at 20 °C, using the experimental absorbance as a measure of the concentration of the formed DNA or TNA, respectively.
It is shown that PC is about 104 time more reactive than DNCB ; primary amines are reacting faster than secondary amines, except piperidine which is far the fastest, and also that reactions of DNCB only conform to the usual free energy correlation with the nucleophilicity parameter (log k2/n).