We herein report the synthesis of novel bis(N-acylated imidazolin-2-imine) nickel complexes for norbornene polymerization and copolymerization with polar monomers.
Iminoyl N-heterocyclic carbine ligand with cationic allyl Pd(II) complex (3) was successfully
synthesized by transmetallation of corresponding Ag complex with one equivalent of
[Pd(allyl)(COD)]+SbF6–. A slightly distorted square planer structure of the Pd(II) complex 3 was confirmed by single crystal X-ray diffraction analysis. The Pd(II) complex 3 is stable in air and found to show moderate activity in the polymerization of norbornene without any activator. The polynorbornene produced with Pd(II) complex 3 was obtained to be stable up to 440 °C. The 1H and 13C NMR spectra of the polymer indicated addition polymerization of norbornene and the presence of the vinylene group at the end of polymer chain.
Nickel and palladium complexes chelating diarylamido-based unsymmetrical [PNNox] pincer ligands have been synthesized and used as catalysts for norbornene polymerization with activities up to 40.3 × 105 g of PNB (mol of Pd)−1 h−1 upon the activation of methylaluminoxane (MAO).
A series of novel aryloxide imidazolin-2-imine bidentate neutral Pd(ii) complexes with different substituents on the imidazolin-2-imine ligand were synthesized and characterized.
Synthesis of Cationic Pd(II) Complexes with 5-Membered Ring Chelating Iminoylcarbene Ligand and Its Catalytic Activity on Norbornene Polymerization