Hybrid polymeric ligands and polymer supported catalysts containing cyclophosphazenes

Abstract

Reaction of N₃P₃Cl₆ with HO-C₆H₄-p-C₆H₄-p-CH=CH₂ affords N₃P₃Cl₅O-C₆H₄-p-C₆H₄-p-CH=CH₂ (1). Compound 1 reacts with 3,5-dimethylpyrazole to afford N₃P₃(3,5-Me₂Pz)₅(O-C₆H₄-p-C₆H₄-p-CH=CH₂) (2); the latter is copolymerised with 1,4-divinylbenzene to afford the multi-pyrazolyl containing cross-linked polymer CPPL. Reaction of CPPL with CuCl₂ affords the metallated derivative CPPL-Cu, which has been shown to be an excellent catalyst for the hydrolysis of activated phosphate esters. In a different approach, 1 has been converted to the phosphinyl ligand N₃P₃(OC₆H₄-p-PPh₂)₅(O-C₆H₄-p-C₆H₄-p-CH=CH₂), which was copolymerised with 1,4-divinylbenzene to afford the multi-phosphine containing cross-linked polymer CPPLP. Reaction of CPPLP with PdCl₂(PhCN)₂ affords the metallated derivative CPPLP-Pd, which has been shown to be catalytically active for the Heck arylation of olefins.