Half-Sandwich Scandium Bis(amide) Complexes as Efficient Catalyst Precursors for Syndiospecific Polymerization of Styrene
详细信息 查看全文
- 作者：Yunjie Luo ; Xiaoying Feng ; Yibin Wang ; Shimin Fan ; Jue Chen ; Yinlin Lei ; Hongze Liang
- 刊名：Organometallics
- 出版年：2011
- 出版时间：June 27, 2011
- 年：2011
- 卷：30
- 期：12
- 页码：3270-3274
- 全文大小：753K
- 年卷期：v.30,no.12(June 27, 2011)
- ISSN：1520-6041
文摘
Amine elimination reactions of the scandium tris(amide) complexes Sc[N(SiRMe2)3](THF)n (R = H, n = 1; R = Me, n = 0) with 1 equiv of the substituted cyclopentadienes C5Me4R鈥睭 (R鈥?= Me, SiMe3) afforded the series of thermally stable half-sandwich scandium bis(amide) complexes (C5Me5)Sc[N(SiHMe2)2]2 (1), (C5Me4SiMe3)Sc[N(SiHMe2)2]2 (2), and (C5Me5)Sc[N(SiMe3)2]2 (3). In the presence of AliBu3, activated by an equimolar amount of [Ph3C][B(C6F5)4], all these complexes showed high activity toward styrene polymerization to give high-molecular-weight polystyrene (Mn > 104) with high syndiotacticity (rrrr >99%).