title: Aromaticity and aminopyrroles: desmotropy and solution tautomerism of 1H-pyrrol-3-aminium and 1H-pyrrol-3(2H)-iminium cation: a stable σ-complex.
abstract: Protonation of 3-aminopyrrole at C-2 gave the σ-complex 1H-pyrrol-3(2H)-iminium cation, whereas protonation at the exoamino group gave its 1H-pyrrol-3-aminium tautomer. Both tautomers were isolated as their respective tetrakis(pentafluorophenyl)borate salt, an example of desmotropy. In solution, the NH(3)-tautomer was favored in hydrogen-bonding solvents and the CH(2)-tautomer in CH(2)Cl(2). A combination of effects on the aromaticity of the aminopyrrole ring increased the relative stability of the σ-complexes (conjugate acids) such that they can be readily observed or isolated.
authors.affiliation: Department of Chemistry, Penn State Brandywine, 25 Yearsley Mill Road, Media, Pennsylvania 19063, USA. mxd19@psu.edu
authors.forename: Michael
authors.initials: M
authors.lastname: De Rosa
authors.forename: David
authors.initials: D
authors.lastname: Arnold