title: Alkenylthioimidoyl radicals: competition between beta-scission and cyclization to dihydrothiophen-2-ylidene-amines.
abstract: [reaction: see text] But-3-enylthioimidoyl radicals were shown by EPR spectroscopy and end product analysis to ring-close predominantly in the 5-exo mode with a rate constant of 2.4 x 10(4) s(-)(1) at 300 K to afford substituted dihydrothiophenylmethyl radicals. This ring closure was in competition with dissociation to but-3-enyl radicals and an isothiocyanate. The dissociation predominated at temperatures above ca. 300 K.
authors.affiliation: School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK.
authors.forename: Matteo
authors.initials: M
authors.lastname: Minozzi
authors.forename: Daniele
authors.initials: D
authors.lastname: Nanni
authors.forename: John C
authors.initials: JC
authors.lastname: Walton