Manipulating Pre-equilibria in Olefin Polymerization Catalysis: Backbone-Stiffening Converts a Living into a Highly Active Salan-type Catalystстатья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:Stiffening of the catalyst backbone of salan-type catalyst 1 via 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.