title: Low-Temperature Isolation of the Bicyclic Phosphinophosphonium Salt [Mes*2P4Cl][GaCl4].
abstract: The reaction of [ClP(μ-PMes*)]2 (1) with the Lewis acid GaCl3 yielded a hitherto unknown tetraphosphabicyclo[1.1.0]butan-2-ium salt, [Mes*P4(Cl)Mes*][GaCl4] (3[GaCl4]), which incorporates a positively charged phosphonium center within its bicyclic P4 scaffold. The formation of the title compound was studied by means of low-temperature NMR experiments. This led to the identification of an intermediate cyclotetraphosphenium cation, which was trapped by reaction with dimethylbutadiene (dmb). All of the compounds were fully characterized by experimental and computational methods.
authors.affiliation: Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock (Germany).
authors.forename: Jonas
authors.initials: J
authors.lastname: Bresien
authors.affiliation: Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock (Germany).
authors.forename: Kirill
authors.initials: K
authors.lastname: Faust
authors.affiliation: Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock (Germany). axel.schulz@uni-rostock.de.|Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock (Germany). axel.schulz@uni-rostock.de.
authors.forename: Axel
authors.initials: A
authors.lastname: Schulz
authors.affiliation: Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock (Germany).
authors.forename: Alexander
authors.initials: A
authors.lastname: Villinger
keywords: NMR spectroscopy; bicyclic compounds; phosphorus cations; phosphorus compounds; ring systems