title: Substituent effects on the nonradical reactivity of 4-dehydropyridinium cation.
abstract: Recent studies have shown that the reactivity of the 4-dehydropyridinium cation significantly differs from the reactivities of its isomers toward tetrahydrofuran. While only hydrogen atom abstraction was observed for the 2- and 3-dehydropyridinium cations, nonradical reactions were observed for the 4-isomer. In order to learn more about these reactions, the gas-phase reactivities of the 4-dehydropyridinium cation and several of its derivatives toward tetrahydrofuran were investigated in a Fourier transform ion electron resonance mass spectrometer. Both radical and nonradical reactions were observed for most of these positively charged radicals. The major parameter determining whether nonradical reactions occur was found to be the electron affinity of the radicals--only those with relatively high electron affinities underwent nonradical reactions. The reactivities of the monoradicals are also affected by hydrogen bonding and steric effects.
authors.affiliation: Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2038, USA.
authors.forename: Bartłomiej J
authors.initials: BJ
authors.lastname: Jankiewicz
authors.forename: Jinshan
authors.initials: J
authors.lastname: Gao
authors.forename: Jennifer N
authors.initials: JN
authors.lastname: Reece
authors.forename: Nelson R
authors.initials: NR
authors.lastname: Vinueza
authors.forename: Padmaja
authors.initials: P
authors.lastname: Narra
authors.forename: John J
authors.initials: JJ
authors.lastname: Nash
authors.forename: Hilkka I
authors.initials: HI
authors.lastname: Kenttämaa
mesh_terms: D002412:Cations; D004583:Electrons; D005663:Furans / Q000737:chemistry*; D006860:Hydrogen Bonding; D007536:Isomerism; D013058:Mass Spectrometry; D011726:Pyridinium Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity
chemical_list: D002412:Cations; D005663:Furans; D011726:Pyridinium Compounds; C018674:tetrahydrofuran