A Phosphorus-Based Pacman Dication Generated by Cooperative Self-Activation of a Pacman Phosphane |
| |
Authors: | Liesa Eickhoff Leon Ohms Dr Jonas Bresien Dr Alexander Villinger Dr Dirk Michalik Prof?Dr Axel Schulz |
| |
Institution: | Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany |
| |
Abstract: | Formal coordination of phosphorus(III) by a calix4]pyrrole Schiff base ligand was achieved through the reaction of this ligand with PCl3 under basic conditions. The reaction product adopts a Pacman conformation with two P?Cl moieties, one in exo and one in endo position. It represents the first non-metal compound of calix4]pyrrole Schiff base ligands and of Pacman ligands in general. The spatial neighborhood of the two phosphorus atoms enables cooperative reactions. As a first example, the chloride abstraction with AgOTf is presented, yielding a macrocyclic dication with two embedded phosphorus(III) monocations, which both undergo a cooperative, internal activation reaction with an adjacent C=N double bond. This intramolecular redox process affords two pentacoordinated phosphorus(V) centers within the Pacman dication. All reaction products were fully characterized and all results are supported by computations. |
| |
Keywords: | activation macrocyle Pacman phosphorus cation redox reaction |
|
|