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.Stiffening the catalyst backbone of a slow salan-type catalyst converts it into a highly active indanosalan catalyst, producing highly isotactic PP with an activity rivalling the most productive known salan-catalyst, with much higher MW capability.

Manipulating pre-equilibria in olefin polymerization catalysis: backbone-stiffening converts a living into a highly active salan-type catalyst

Dall'Anese, A;Zuccaccia, C
;
Macchioni, A;
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.Stiffening the catalyst backbone of a slow salan-type catalyst converts it into a highly active indanosalan catalyst, producing highly isotactic PP with an activity rivalling the most productive known salan-catalyst, with much higher MW capability.
2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1566037
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