440084-13-9Relevant articles and documents
Synthetic optimization and scale-up of imino-amido hafnium and zirconium olefin polymerization catalysts
Zhang, Chunming,Pan, Heqi,Klosin, Jerzy,Tu, Siyu,Jaganathan, Arvind,Fontaine, Philip P.
, p. 1383 - 1391 (2015/11/03)
Improved synthetic protocols were developed for the safe, efficient, and scalable preparation of imino-amido Hf and Zr complexes that are precatalysts for olefin polymerizations. Facile syntheses of four imino-amido complexes were achieved in high yields by direct reactions of 4 equiv of MeMgBr with mixtures of the corresponding bisimines or imine-amines and MCl4 (M = Hf, Zr). These synthetic routes eliminate the use of the pyrophoric reagents AlMe3 and n-BuLi used previously, avoid cryogenic conditions, and lead to significant yield improvements. Notably, competing reaction pathways between the bis-imine and MeLi were observed. This led to the discovery of the selective addition of MeMgBr to the bis-imine, which was successfully applied in the synthesis of the imine-amine ligand.
A thermally robust amine-imine nickel catalyst precursor for living polymerization of ethylene above room temperature
Gao, Haiyang,Hu, Haibin,Zhu, Fangming,Wu, Qing
supporting information; experimental part, p. 3312 - 3314 (2012/04/23)
A bulky amine-imine nickel complex containing two 2,6-diisopropyl substituents after activation with MMAO or Et2AlCl can polymerize ethylene in a living fashion over a period of 120 minutes at room temperature or above. The Royal Society of Chemistry 2012.