Stiffening of the catalyst backbone of salan-type catalyst 1via ring closure yields indanosalan 3 and increases activity and molar mass capability by two orders of magnitude. In propene polymerization, catalyst 3 is highly isotactic selective and nearly as active as one of the most productive known salan-catalysts today (2), showing much higher molar mass capability. NMR studies provide evidence of the identity of the active metal-polymeryl species for the catalyst pair 1/3, explaining their vast activity differences: the traditional salan catalyst 1 is trapped in the inactive mer-mer configuration, while indanosalan 3 prefers the active fac-fac isomer.
Manipulating pre-equilibria in olefin polymerization catalysis: backbone-stiffening converts a living into a highly active salan-type catalyst / Uborsky, D. V.; Sharikov, M. I.; Goryunov, G. P.; Li, K. M.; Dall'Anese, A.; Zuccaccia, C.; Vittoria, A.; Iovine, T.; Galasso, G.; Ehm, C.; Macchioni, A.; Busico, V.; Voskoboynikov, A. Z.; Cipullo, R.. - In: INORGANIC CHEMISTRY FRONTIERS. - ISSN 2052-1553. - 10:21(2023), pp. 6401-6406. [10.1039/d3qi01537h]
Manipulating pre-equilibria in olefin polymerization catalysis: backbone-stiffening converts a living into a highly active salan-type catalyst
Vittoria A.;Ehm C.;Busico V.;Cipullo R.
2023
Abstract
Stiffening of the catalyst backbone of salan-type catalyst 1via ring closure yields indanosalan 3 and increases activity and molar mass capability by two orders of magnitude. In propene polymerization, catalyst 3 is highly isotactic selective and nearly as active as one of the most productive known salan-catalysts today (2), showing much higher molar mass capability. NMR studies provide evidence of the identity of the active metal-polymeryl species for the catalyst pair 1/3, explaining their vast activity differences: the traditional salan catalyst 1 is trapped in the inactive mer-mer configuration, while indanosalan 3 prefers the active fac-fac isomer.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.