Efficient Norbornene (NBE) Incorporation in Ethylene/NBE Copolymerization by Half-Titanocene Catalysts Containing Chlorinated Aryloxo Ligands

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• 作者：Weizhen Zhao ; Qing Yan ; Ken Tsutsumi ; Kotohiro Nomura
• 刊名：Organometallics
• 出版年：2016
• 出版时间：June 13, 2016
• 年：2016
• 卷：35
• 期：11
• 页码：1895-1905
• 全文大小：542K
• 年卷期：0
• ISSN：1520-6041

文摘

Synthesis and structural analysis of a series of half-titanocenes containing chlorinated phenoxy ligands of the type Cp′TiCl₂(OAr) [Cp′ = Cp, Ar = 2,6-Cl₂C₆H₃ (1), 2,4,6-Cl₃C₆H₂ (2), C₆Cl₅ (3); Cp′ = indenyl, Ar = 2,6-Cl₂C₆H₃ (4), 2,4,6-Cl₃C₆H₂ (5), C₆Cl₅ (6)] and CpTiMe₂(OAr) [Ar = 2,4,6-Cl₃C₆H₂ (9), C₆Cl₅ (10)] have been explored. The Ti–O bond distances in 1–3 are apparently longer than those of the reported aryloxo-modified half-titanocenes, and the Ti–O–C(in phenyl) angles in 1–3 are also rather small. The Cp analogues (1–3) exhibited higher catalytic activities than the reported (indenyl)TiCl₂(O-2,6-ⁱPr₂C₆H₃) in ethylene copolymerization with norbornene (NBE) in the presence of MAO; these complexes (1–3) also showed better NBE incorporation than those reported previously.