440084-14-0Relevant 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.
Imino-amide catalyst compositions for the polymerization of olefins
-
Page/Page column 25-26, (2010/02/12)
The present invention provides a catalyst precursor and catalyst system comprising the precursor, an embodiment of the precursor is selected from the following structures: wherein T is a bridging group; M is selected from Groups 3 to 7 atoms, and the Lant
