title: Tetra-cationic imidazoliumyl-substituted phosphorus-sulfur heterocycles from a cationic organophosphorus sulfide.
abstract: The reaction of imidazoliumyl-substituted P((III)) cations of type [L((R,Me))PCl2](+) (3a,b(+); L(R,Me) = imidazolium-2-yl a: R = Me; b: R = iPr) with (Me3Si)2S leads to the formation of tetra-cationic, eight-membered phosphorus sulfur heterocycles [L((R,Me))PS]4(4+) (9a,b(4+)), which can be explained by the tetramerization of the intermediately formed cationic phosphorus monosulfide [L((R,Me))PS](+) (8a,b(+)). The P4S4 ring adopts a crown conformation as observed for cyclo-S8. The Lewis base DMAP (4-dimethylaminopyridine) initiates a deoligomerization- and dismutation reaction of 9a,b(4+) to give P((I)) centered cation [L((R,Me))2P](+) (12a,b(+)) and phosphorus disulfide [(DMAP)2PS2](+) (14(+)).
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany. jan.weigand@tu-dresden.de.
authors.forename: Florian D
authors.initials: FD
authors.lastname: Henne
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany. jan.weigand@tu-dresden.de.
authors.forename: Fabian A
authors.initials: FA
authors.lastname: Watt
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany. jan.weigand@tu-dresden.de.
authors.forename: Kai
authors.initials: K
authors.lastname: Schwedtmann
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany. jan.weigand@tu-dresden.de.
authors.forename: Felix
authors.initials: F
authors.lastname: Hennersdorf
authors.affiliation: Department of Computational Chemistry, Academy of Sciences of the Czech Republic, 16610 Praha 6, Czech Republic and Department of Physical Chemistry, Palacky University, 771 46 Olomouc, Czech Republic.
authors.forename: Malte
authors.initials: M
authors.lastname: Kokoschka
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany. jan.weigand@tu-dresden.de.
authors.forename: Jan J
authors.initials: JJ
authors.lastname: Weigand