Safety of 2-Chloro-1,3-bis(2,6-diisopropylphenyl)-1H-imidazol-3-ium chloride. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2-Chloro-1,3-bis(2,6-diisopropylphenyl)-1H-imidazol-3-ium chloride, is researched, Molecular C27H36Cl2N2, CAS is 1228185-09-8, about Norbornene polymerization and copolymerization with 1-alkenes by neutral palladium complexes bearing aryloxide imidazolin-2-imine ligand. Author is Li, Mingyuan; Zhang, Hu; Cai, Zhengguo; Eisen, Moris S..
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. In the single crystal X-ray diffraction anal., the complexes Pd1 and Pd2 adopted almost square-planar geometries, while Pd3 bearing the bulkier 2,6-bis(diphenylmethyl)-4-methylphenyl substituent was obtained as the allyl adducted base-free η3 coordination mode. In the presence of very low EtAlCl2 loadings (100 equivalent), these Pd(II) complexes exhibited high activity (∼106 g mol-1 h-1) and good thermal stability (up to 100°C) toward the addition polymerization of norbornene. Most importantly, these Pd(II) catalysts were able to promote the copolymerization of norbornene with 1-dodecene and 1-octadecene with high activity (>105 g mol-1 h-1) to yield high-mol.-weight (Mn up to 5.59 x 104 g mol-1) copolymers. The 1-alkene incorporation of resulting copolymers was modulated in a wide range (5.1-15.3%) by changing the comonomer feed ratio, accompanied by the control of the glass transition temperature (Tg = 231.6-309.6°C). These complexes are rare examples of neutral Pd(II) complexes toward the efficient synthesis of norbornene-based cyclic olefin copolymers (COCs).
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