Nitration of NN-dimethyl-p-toluidine. Spectroscopic evidence for the bulk formation of a σ-complex formed by ipso-attack
Abstract
In 70–77% sulphuric acid, the nitration of NN-dimethyl-p-toluidine proceeds in two clearly separated stages: the formation of the σ-complex (I) by ipso-attack and the slow rearrangement of this ion to the nitrocompound (II).