Citation: . STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*[J]. Chinese Journal of Polymer Science, ;2001, 19(4): 407-413. shu

STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*

Received Date: 21 August 2000
Revised Date: 18 October 2000

Two unbridged metallocene catalysts, bis (2, 4, 7-trimethylindenyl)zirconium dichloride (met-I) and bis(2, 4, 6-trimethylindenyl) zirconium dichloride (met-II), which are different in the position o f substituents on the six-membered ringof the indenyl ligands were synthesized. The effect of substituents in the two metallocenes on the propylene polymerizationwas studied in the presence of methylaluminoxane (MAO) and triisobutylaluminium (TIBA). From the analysis ofmicrostructure determined by 13C-NMR, it was demonstrated that the polymers produced by met-II have higher [mmmm] isotactic sequences than that of met-I.Using a mechanism based on model statistical analysis,it was found that chain-end model was dominant for met-I.However,met-II obeys the concurrent two-sites model during polymerization,which can be attributed to the existence of "racemic-like"conformer in its system.
1. [1]
  Hailong He , Wenbing Wang , Wenmin Pang , Chen Zou , Dan Peng . Double stimulus-responsive palladium catalysts for ethylene polymerization and copolymerization. Chinese Chemical Letters, 2024, 35(7): 109534-. doi: 10.1016/j.cclet.2024.109534
2. [2]
  Meng Shan , Yongmei Yu , Mengli Sun , Shuping Yang , Mengqi Wang , Bo Zhu , Junbiao Chang . Bifunctional organocatalyst-catalyzed dynamic kinetic resolution of hemiketals for synthesis of chiral ketals via hydrogen bonding control. Chinese Chemical Letters, 2025, 36(1): 109781-. doi: 10.1016/j.cclet.2024.109781
3. [3]
  Jun Zhang , Zhiyao Zheng , Can Zhu . Stereochemical editing: Catalytic racemization of secondary alcohols and amines. Chinese Chemical Letters, 2024, 35(5): 109160-. doi: 10.1016/j.cclet.2023.109160
4. [4]
  Yang Yang , Jing-Li Luo , Xian-Zhu Fu . Water-oxidation intermediates enabling electrochemical propylene epoxidation. Chinese Journal of Structural Chemistry, 2024, 43(5): 100269-100269. doi: 10.1016/j.cjsc.2024.100269
5. [5]
  Min Fu , Pan He , Sen Zhou , Wenqiang Liu , Bo Ma , Shiying Shang , Yaohao Li , Ruihan Wang , Zhongping Tan . An unexpected stereochemical effect of thio-substituted Asp in native chemical ligation. Chinese Chemical Letters, 2024, 35(8): 109434-. doi: 10.1016/j.cclet.2023.109434
6. [6]
  Zhongjie Li , Xiangyue Kong , Yuhao Liu , Huayu Qiu , Lingling Zhan , Shouchun Yin . Progress of additives for morphology control in organic photovoltaics. Chinese Chemical Letters, 2024, 35(6): 109378-. doi: 10.1016/j.cclet.2023.109378
7. [7]
  Huangjie Lu , Yingzhe Du , Peng Lin , Jian Lin . Separation of americium from lanthanides based on oxidation state control. Chinese Journal of Structural Chemistry, 2024, 43(10): 100344-100344. doi: 10.1016/j.cjsc.2024.100344
8. [8]
  Bing Niu , Honggao Huang , Liwei Luo , Li Zhang , Jianbo Tan . Coating colloidal particles with a well-defined polymer layer by surface-initiated photoinduced polymerization-induced self-assembly and the subsequent seeded polymerization. Chinese Chemical Letters, 2025, 36(2): 110431-. doi: 10.1016/j.cclet.2024.110431
9. [9]
  Junying LI , Xinyan CHEN , Xihui DIAO , Muhammad Yaseen , Chao CHEN , Hao WANG , Chuansong QI , Wei LI . Chiral fluorescent sensor Tb³⁺@Cd-CP based on camphoric acid for the enantioselective recognition of R- and S-propylene glycol. Chinese Journal of Inorganic Chemistry, 2024, 40(12): 2497-2504. doi: 10.11862/CJIC.20240084
10. [10]
  Tianbo Jia , Lili Wang , Zhouhao Zhu , Baikang Zhu , Yingtang Zhou , Guoxing Zhu , Mingshan Zhu , Hengcong Tao . Modulating the degree of O vacancy defects to achieve selective control of electrochemical CO₂ reduction products. Chinese Chemical Letters, 2024, 35(5): 108692-. doi: 10.1016/j.cclet.2023.108692
11. [11]
  Kuangdi Luo , Yang Qin , Xuehao Zhang , Hanxu Ji , Heao Zhang , Jiangtian Li , Xianjin Xiao , Xinyu Wang . Regulable toehold lock for the effective control of strand displacement reaction sequence and circuit leakage. Chinese Chemical Letters, 2024, 35(7): 109104-. doi: 10.1016/j.cclet.2023.109104
12. [12]
  Yan Liu , Yang Wang , Jiayi Zhu , Xuxian Su , Xudong Lin , Liang Xu , Xiwen Xing . Employing pH-responsive RNA triplex to control CRISPR/Cas9-mediated gene manipulation in mammalian cells. Chinese Chemical Letters, 2024, 35(9): 109427-. doi: 10.1016/j.cclet.2023.109427
13. [13]
  Xinyu Tian , Jiaxiang Guo , Zeyi Li , Shihou Sheng , Tianyu Zhang , Xianfei Li , Chuandong Dou . Control over electronic structures of organic diradicaloids via precise B/O-heterocycle fusion. Chinese Chemical Letters, 2025, 36(1): 110174-. doi: 10.1016/j.cclet.2024.110174
14. [14]
  Xue Zhao , Mengshan Chen , Dan Wang , Haoran Zhang , Guangzhi Hu , Yingtang Zhou . Ultrafine nano-copper derived from dopamine polymerization & synchronous adsorption achieve electrochemical purification of nitrate to ammonia in complex water environments. Chinese Chemical Letters, 2024, 35(8): 109327-. doi: 10.1016/j.cclet.2023.109327
15. [15]
  Jian Song , Shenghui Wang , Qiuge Liu , Xiao Wang , Shuo Yuan , Hongmin Liu , Saiyang Zhang . N-Benzyl arylamide derivatives as novel and potent tubulin polymerization inhibitors against gastric cancers: Design, structure–activity relationships and biological evaluations. Chinese Chemical Letters, 2025, 36(2): 109678-. doi: 10.1016/j.cclet.2024.109678
16. [16]
  Fei Yin , Erli Yang , Xue Ge , Qian Sun , Fan Mo , Guoqiu Wu , Yanfei Shen . Coupling WO₃₋_x dots-encapsulated metal-organic frameworks and template-free branched polymerization for dual signal-amplified electrochemiluminescence biosensing. Chinese Chemical Letters, 2024, 35(4): 108753-. doi: 10.1016/j.cclet.2023.108753
17. [17]
  Zhenkang Ai , Hui Chen , Xuebin Liao . Nickel-catalyzed decarboxylative difluoromethylation and alkylation of alkenes. Chinese Chemical Letters, 2025, 36(3): 109954-. doi: 10.1016/j.cclet.2024.109954
18. [18]
  Fanxin Kong , Hongzhi Wang , Huimei Duan . Inhibition effect of sulfation on Pt/TiO2 catalysts in methane combustion. Chinese Journal of Structural Chemistry, 2024, 43(5): 100287-100287. doi: 10.1016/j.cjsc.2024.100287
19. [19]
  Xianxu Chu , Lu Wang , Junru Li , Hui Xu . Surface chemical microenvironment engineering of catalysts by organic molecules for boosting electrocatalytic reaction. Chinese Chemical Letters, 2024, 35(8): 109105-. doi: 10.1016/j.cclet.2023.109105
20. [20]
  Pingfan Zhang , Shihuan Hong , Ning Song , Zhonghui Han , Fei Ge , Gang Dai , Hongjun Dong , Chunmei Li . Alloy as advanced catalysts for electrocatalysis: From materials design to applications. Chinese Chemical Letters, 2024, 35(6): 109073-. doi: 10.1016/j.cclet.2023.109073

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(592)
HTML views(2)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return