NONBRIDGED HALF-TITANOCENES CONTAINING ANIONIC ANCILLARY DONOR LIGANDS: PROMISING NEW CATALYSTS FOR PRECISE SYNTHESIS OF CYCLIC OLEFIN COPOLYMERS (COCs)

Kotohiro Nomura

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NONBRIDGED HALF-TITANOCENES CONTAINING ANIONIC ANCILLARY DONOR LIGANDS: PROMISING NEW CATALYSTS FOR PRECISE SYNTHESIS OF CYCLIC OLEFIN COPOLYMERS (COCs)

Feature Article | Updated：2021-06-21

- NONBRIDGED HALF-TITANOCENES CONTAINING ANIONIC ANCILLARY DONOR LIGANDS: PROMISING NEW CATALYSTS FOR PRECISE SYNTHESIS OF CYCLIC OLEFIN COPOLYMERS (COCs)
- Vol. 26, Issue 5, Pages: 513-523(2008)
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- Published：20 September 2008
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Kotohiro Nomura. NONBRIDGED HALF-TITANOCENES CONTAINING ANIONIC ANCILLARY DONOR LIGANDS: PROMISING NEW CATALYSTS FOR PRECISE SYNTHESIS OF CYCLIC OLEFIN COPOLYMERS (COCs)[J]. 2008, 26(5): 513-523.
DOI：

Kotohiro Nomura. NONBRIDGED HALF-TITANOCENES CONTAINING ANIONIC ANCILLARY DONOR LIGANDS: PROMISING NEW CATALYSTS FOR PRECISE SYNTHESIS OF CYCLIC OLEFIN COPOLYMERS (COCs)[J]. 2008, 26(5): 513-523. DOI：

摘要

Precise

efficient copolymerizations of ethylene with cyclic olefins [norbornene (NBE)

cyclopentene (CPE)] using nonbridged half-titanocenes of type

TiCl2(L) (Cp

= cyclopentadienyl group

L = aryloxo

ketimide)-MAO catalyst systems have been summarized. CpTiCl2(N＝CtBu2) exhibited both remarkable catalytic activity and efficient NBE incorporation for ethylene/NBE copolymerization: the NBE incorporation by CpTiCl2(X) (X = N＝CtBu2

O-2

6-iPr2C6H3; Cp

＝Cp

C5Me5

indenyl) was related to the calculated coordination energy after ethylene insertion. (tBuC5H4)TiCl2(N＝CtBu) exhibited significant catalytic activities with efficient CPE incorporations in ethylene/CPE copolymerization in the presence of MAO. The polymerization proceeded with exclusive 1

2-CPE incorporation

affording high molecular weight (alternating) copolymers with uniform distributions. Therefore

the cyclopentadienyl fragment (Cp) plays an essential role in terms of both the activity and the efficient cyclic olefin incorporation.

Abstract

Precise

efficient copolymerizations of ethylene with cyclic olefins [norbornene (NBE)

cyclopentene (CPE)] using nonbridged half-titanocenes of type

TiCl2(L) (Cp

= cyclopentadienyl group

L = aryloxo

O-2

6-iPr2C6H3; Cp

＝Cp

C5Me5

2-CPE incorporation

affording high molecular weight (alternating) copolymers with uniform distributions. Therefore

the cyclopentadienyl fragment (Cp) plays an essential role in terms of both the activity and the efficient cyclic olefin incorporation.

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