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Updated: Jul 18, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
Understanding reactivity patterns of the dialkylaniline radical cation
Micha Kirchgessner1, Kesavapillai Sreenath, Karical R Gopidas
1Photosciences and Photonics Group, Chemical Sciences Division, Regional Research Laboratory (CSIR), Trivandrum 695 019, India.
Abstract:
N,N-Dimethylaniline and N,N-diethylaniline react with Cu2+ to form the corresponding amine radical cations. The radical cations were characterized by their absorption spectra. In the absence of any nucleophiles, the radical cations dimerize to give tetraalkylbenzidines, and this reaction can be monitored by absorption spectroscopy. In the presence of nucleophiles such as Cl[negative in circle], Br[negative in circle], or SCN[negative in circle], the radical cations undergo nucleophilic substitution to give para-substituted dialkylanilines in good yields.
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