Synthesis of titanium(IV) complexes that contain the bis(silylamide) ligand of the type 1,8H10NRM2- (R=SiMe3; Si'BulVte, Si'Pr3), and olefin polymerization catalyzed by the [WioHelNRfe] TWWXsCI, brcocatalyst system

Kazuo Takaoki, Kotohiro Nomura, Naofumi Naga, Akio Imai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

[l,8-C,0H6(NSi'BuMe2)2]TiBr2 (4) has been prepared from dilithio salts [l,8-CinH6(NR),]Li, (2) and TiBr4 in Et2O. This complex showed significant catalytic activity for ethylene polymerization in the presence of a cocatalyst, and the activity is the same as those obtained by using chloride analogues such as [1,8-C10H6(NR)2] TiCl2 (3: R = SiMe3 Si'BuMe2 Si'Pr,). The effective cocatalyst was, however, different between the chloride and the bromide complexes. [ArNCH2CH2CH2NAr]TiCl2 (5, Ar = 2,6-iPr2C6H3), which has been known as an effective catalyst for polymerization of 1-hexene, showed lower activity under the same conditions. The broad molecular weight distributions (Mw/Mn for the resultant polymer can be attributed to the scission of titanium-nitrogen bond by cocatalyst, because the narrow MJMnvalue (1.8) was observed if the polymerization was stopped at the initial stage (2 min) under the same reaction conditions.

Original languageEnglish
Pages (from-to)469-472
Number of pages4
JournalStudies in Surface Science and Catalysis
Volume121
Publication statusPublished - 1999
Externally publishedYes

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Alkenes
Titanium
alkenes
Olefins
polymerization
titanium
Ligands
Polymerization
ligands
Chlorides
synthesis
chlorides
hexenes
Molecular weight distribution
Bromides
catalytic activity
bromides
cleavage
molecular weight
Catalyst activity

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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title = "Synthesis of titanium(IV) complexes that contain the bis(silylamide) ligand of the type 1,8H10NRM2- (R=SiMe3; Si'BulVte, Si'Pr3), and olefin polymerization catalyzed by the [WioHelNRfe] TWWXsCI, brcocatalyst system",
abstract = "[l,8-C,0H6(NSi'BuMe2)2]TiBr2 (4) has been prepared from dilithio salts [l,8-CinH6(NR),]Li, (2) and TiBr4 in Et2O. This complex showed significant catalytic activity for ethylene polymerization in the presence of a cocatalyst, and the activity is the same as those obtained by using chloride analogues such as [1,8-C10H6(NR)2] TiCl2 (3: R = SiMe3 Si'BuMe2 Si'Pr,). The effective cocatalyst was, however, different between the chloride and the bromide complexes. [ArNCH2CH2CH2NAr]TiCl2 (5, Ar = 2,6-iPr2C6H3), which has been known as an effective catalyst for polymerization of 1-hexene, showed lower activity under the same conditions. The broad molecular weight distributions (Mw/Mn for the resultant polymer can be attributed to the scission of titanium-nitrogen bond by cocatalyst, because the narrow MJMnvalue (1.8) was observed if the polymerization was stopped at the initial stage (2 min) under the same reaction conditions.",
author = "Kazuo Takaoki and Kotohiro Nomura and Naofumi Naga and Akio Imai",
year = "1999",
language = "English",
volume = "121",
pages = "469--472",
journal = "Studies in Surface Science and Catalysis",
issn = "0167-2991",
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TY - JOUR

T1 - Synthesis of titanium(IV) complexes that contain the bis(silylamide) ligand of the type 1,8H10NRM2- (R=SiMe3; Si'BulVte, Si'Pr3), and olefin polymerization catalyzed by the [WioHelNRfe] TWWXsCI, brcocatalyst system

AU - Takaoki, Kazuo

AU - Nomura, Kotohiro

AU - Naga, Naofumi

AU - Imai, Akio

PY - 1999

Y1 - 1999

N2 - [l,8-C,0H6(NSi'BuMe2)2]TiBr2 (4) has been prepared from dilithio salts [l,8-CinH6(NR),]Li, (2) and TiBr4 in Et2O. This complex showed significant catalytic activity for ethylene polymerization in the presence of a cocatalyst, and the activity is the same as those obtained by using chloride analogues such as [1,8-C10H6(NR)2] TiCl2 (3: R = SiMe3 Si'BuMe2 Si'Pr,). The effective cocatalyst was, however, different between the chloride and the bromide complexes. [ArNCH2CH2CH2NAr]TiCl2 (5, Ar = 2,6-iPr2C6H3), which has been known as an effective catalyst for polymerization of 1-hexene, showed lower activity under the same conditions. The broad molecular weight distributions (Mw/Mn for the resultant polymer can be attributed to the scission of titanium-nitrogen bond by cocatalyst, because the narrow MJMnvalue (1.8) was observed if the polymerization was stopped at the initial stage (2 min) under the same reaction conditions.

AB - [l,8-C,0H6(NSi'BuMe2)2]TiBr2 (4) has been prepared from dilithio salts [l,8-CinH6(NR),]Li, (2) and TiBr4 in Et2O. This complex showed significant catalytic activity for ethylene polymerization in the presence of a cocatalyst, and the activity is the same as those obtained by using chloride analogues such as [1,8-C10H6(NR)2] TiCl2 (3: R = SiMe3 Si'BuMe2 Si'Pr,). The effective cocatalyst was, however, different between the chloride and the bromide complexes. [ArNCH2CH2CH2NAr]TiCl2 (5, Ar = 2,6-iPr2C6H3), which has been known as an effective catalyst for polymerization of 1-hexene, showed lower activity under the same conditions. The broad molecular weight distributions (Mw/Mn for the resultant polymer can be attributed to the scission of titanium-nitrogen bond by cocatalyst, because the narrow MJMnvalue (1.8) was observed if the polymerization was stopped at the initial stage (2 min) under the same reaction conditions.

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