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Published on: April 19, 2019
Generation and Reactivity of 1-Imidocarbenium Cations in the Friedel-Crafts-type Reaction
Jakub Adamek1,2, Roman Mazurkiewicz1, Anna Węgrzyk-Schlieter1
1Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Silesian University of Technology, Bolesława Krzywoustego 4, 44-100 Gliwice, Poland.
Abstract:
Herein, we discuss the formation and reactivity of 1-imidocarbenium cations in Friedel-Crafts-type reaction between 1-imidoalkylphosphonium salts and arenes. The observed weakening of Cα-P+ bond is described qualitatively and quantitatively. The determination of rate constants and activation energies of Cα-P+ bond cleavage enabled systematic reactivity investigations of a series of phosphonium salts with different structures. Finally, the application scope for the imidoalkylation of aromatic hydrocarbons was explored. The results confirm that the generated 1-imidocarbenium cations are reactive enough to alkylate strongly activated, less-activated, or even inactivated aromatic compounds.
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