Details

Autor(en) / Beteiligte

• Tao, Wen-jie
• Nakano, Ryo
• Ito, Shingo
• Nozaki, Kyoko

Titel

Copolymerization of Ethylene and Polar Monomers by Using Ni/IzQO Catalysts

Ist Teil von

• Angewandte Chemie (International ed.), 2016-02, Vol.55 (8), p.2835-2839

Auflage

International ed. in English

Ort / Verlag

Germany: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The replacement of precious metals in catalysis by earth‐abundant metals is currently one of the urgent challenges for chemists. Whereas palladium‐catalyzed copolymerization of ethylene and polar monomers is a valuable method for the straightforward synthesis of functionalized polyolefins, the corresponding nickel‐based catalysts have suffered from poor thermal tolerance and low molecular weight of the polymers formed. Herein, we report a series of neutral nickel complexes bearing imidazo[1,5‐a]quinolin‐9‐olate‐1‐ylidene (IzQO) ligands. The Ni/IzQO system can catalyze ethylene polymerization at 50–100 °C with reasonable activity in the absence of any cocatalyst, whereas most known nickel‐based catalysts are deactivated at this temperature range. The Ni/IzQO catalyst was successfully applied to the copolymerization of ethylene with allyl monomers to obtain the corresponding copolymers with the highest molecular weight reported for a Ni‐catalyzed system. So long: A series of neutral nickel complexes bearing imidazo[1,5‐a]quinolin‐9‐olate‐1‐ylidene (IzQO) ligands is reported. The Ni/IzQO system can catalyze ethylene polymerization at 50–100 °C in the absence of any co‐catalyst, whereas most known nickel‐based catalysts are deactivated at this temperature range. This was successfully applied to the copolymerization of ethylene with allyl monomers to obtain the corresponding copolymers with high molecular weight.