Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202103983
Keywords
activation; macrocyle; Pacman; phosphorus cation; redox reaction
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SCHU 1170/12-2]
- University of Rostock via the PhD Scholarship Program
- Projekt DEAL
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The formal coordination of phosphorus(III) was achieved by reacting a calix[4]pyrrole Schiff base ligand with PCl3 under basic conditions, resulting in a Pacman conformation reaction product. The spatial neighborhood of the two phosphorus atoms enables cooperative reactions, demonstrated by the chloride abstraction reaction with AgOTf to yield two embedded phosphorus(III) monocations.
Formal coordination of phosphorus(III) by a calix[4]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 calix[4]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.
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