title: Palladium-catalyzed chain-growth polycondensation of AB-type monomers: high catalyst turnover and polymerization rates.
abstract: Chain-growth catalyst-transfer polycondensations of AB-type monomers is a new and rapidly developing tool for the preparation of well-defined π-conjugated (semiconducting) polymers for various optoelectronic applications. Herein, we report the Pd/PtBu3-catalyzed Negishi chain-growth polycondensation of AB-type monomers, which proceeds with unprecedented TONs of above 100,000 and TOFs of up to 280 s(-1). In contrast, related AA/BB-type step-growth polycondensation proceeds with two orders of magnitude lower TONs and TOFs. A similar trend was observed in Suzuki-type polycondensation. The key impact of the intramolecular (vs. intermolecular) catalyst-transfer process on both polymerization kinetics and catalyst lifetime has been revealed.
authors: Leibniz Institute of Polymer Research Dresden, Hohe Straße 6, 01069 Dresden (Germany).
authors: Roman
authors: R
authors: Tkachov
authors: Volodymyr
authors: V
authors: Senkovskyy
authors: Tetyana
authors: T
authors: Beryozkina
authors: Kseniya
authors: K
authors: Boyko
authors: Vasiliy
authors: V
authors: Bakulev
authors: Albena
authors: A
authors: Lederer
authors: Karin
authors: K
authors: Sahre
authors: Brigitte
authors: B
authors: Voit
authors: Anton
authors: A
authors: Kiriy
keywords: chain growth; conjugated polymers; homogeneous catalysis; palladium; polycondensation