The Effect of SiMe 3  and SiEt 3   Para  Substituents for High Activity and Introduction of a Hydroxy Group in Ethylene Copolymerization Catalyzed by Phenoxide‐Modified Half‐Titanocenes | Zendy

Kitphaitun Suphitchaya | Zendy; Yan Qing | Zendy; Nomura Kotohiro | Zendy

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The Effect of SiMe 3 and SiEt 3 Para Substituents for High Activity and Introduction of a Hydroxy Group in Ethylene Copolymerization Catalyzed by Phenoxide‐Modified Half‐Titanocenes

Author(s) -

Kitphaitun Suphitchaya,

Yan Qing,

Nomura Kotohiro

Publication year - 2020

Publication title -

angewandte chemie international edition

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.831

H-Index - 550

eISSN - 1521-3773

pISSN - 1433-7851

DOI - 10.1002/anie.202010559

Subject(s) - copolymer , ethylene , catalysis , chemistry , polymer chemistry , polymer , medicinal chemistry , organic chemistry

Remarkable effects of SiMe 3 and SiEt 3 para‐substituents in the phenoxide‐modified half‐titanocenes, Cp*TiCl 2 (O‐2,6‐ i Pr 2 ‐4‐R‐C 6 H 2 ) [R=SiMe 3 ( 6 ), SiEt 3 ( 7 )], toward the catalytic activities in ethylene copolymerizations with 2‐methyl‐1‐pentene, 1‐decene, 1‐dodecene and with 9‐decen‐1‐ol (DC‐OH) have been demonstrated. The activities by 6 , 7 at 50 °C showed higher than those conducted at 25 °C in all cases in the presence of MAO cocatalyst. Efficient synthesis of high‐molecular‐weight (HMW) ethylene copolymers incorporating DC‐OH (or 5‐hexen‐1‐ol, HX‐OH) has been attained in the copolymerization by 7 , which showed better DC‐OH (HX‐OH) incorporation at 50 °C to afford the HMW copolymers, poly(ethylene‐co‐DC‐OH)s, with high activities (activity 1.21–3.81×10 5 kg‐polymer mol −1 ‐Ti h, M n =6.55–10.0×10 4 , DC‐OH 2.3–3.6 mol %).

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