Synthesis of ethylene copolymers with 2-allylphenol by using half-titanocene catalysts containing SiEt-, SiPr-substituted phenoxide ligands, CpTiCl(O-2,6-Pr-4-SiR-CH) (R = Et, Pr)

• Published in: Catalysis science & technology 2024-07, Vol.14 (13), p.38-386
• Main Authors: Jiang, Youshu, Shimoyama, Daisuke, Gao, Jiahao, Nomura, Kotohiro
• Format: Article
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/d4cy00578c

Ethylene copolymerisation with 2-allylphenol (AP, pretreated with Al i Bu 3 ) catalysed by Cp*TiCl 2 (O-2,6- i Pr 2 -4-R-C 6 H 2 ) (R = SiEt 3 , Si i Pr 3 ) gave rather high molecular weight copolymers containing a phenolic moiety ( M n = 9300-32 500 g mol −1 , AP up to 11.7 mol%) with uniform compositions (observed as a sole melting temperature from the DSC thermogram). The catalysts containing trialkylsilyl substituted phenoxide ligands were effective in the copolymerisation; pretreatment of AP with Al i Bu 3 and 2,6- t Bu 2 C 6 H 3 OH was effective for obtaining the copolymers with high catalytic activity and efficient AP incorporation. Efficient synthesis of ethylene copolymers with 2-allylphenol has been achieved by using the Cp*TiCl 2 (O-2,6- i Pr 2 -SiEt 3 -C 6 H 2 )-MAO catalyst system.