title: Two C₂-symmetric chelating P₂-bisphosphazene superbases connected via a binaphthyl backbone--synthesis, structural features and preparation of a cationic alkyl aluminum complex.
abstract: Two P2-phosphazenyl groups were linked via a C2-symmetric binaphthyl backbone resulting in two novel chiral superbases with dimethylamino and pyrrolidino substituents. We investigated their basic properties and coordination chemistry towards a cationic alkyl aluminum fragment. The outstanding basicity of the chiral tetrasphosphazenes presented herein leads to interesting perspectives for application in asymmetric Brønsted base catalysis.
authors.affiliation: Philipps-Universität Marburg, Fachbereich Chemie, Hans-Meerwein-Straße, 35032 Marburg, Germany. jsu@staff.uni-marburg.de.
authors.forename: Julius F
authors.initials: JF
authors.lastname: Kögel
authors.forename: Nis-Julian
authors.initials: NJ
authors.lastname: Kneusels
authors.forename: Jörg
authors.initials: J
authors.lastname: Sundermeyer