Ring Opening Metathesis Polymerization of Norbornene by WCl6: Formation of WCl5 and WCl4 and Their Catalytic Activity

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Title:Ring Opening Metathesis Polymerization of Norbornene by WCl6: Formation of WCl5 and WCl4 and Their Catalytic Activity
Creators:
Balcar, Hynek
Bastl, Zdeněk
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 61, 9, pp. 1353-1359
Uncontrolled Keywords:Ring opening metathesis polymerization, Norbornene, Tungsten chlorides

Abstract

Reaction between WCl<sub>6 </sub>and norbornene in benzene and cyclohexane, respectively, was investigated using UV/VIS, ESR and XPS spectroscopy in order to establish the main reaction products on the tungsten side and their relation to the initiation of ring opening metathesis polymerization (ROMP) of norbornene. The tungsten compounds: WCl<sub>5</sub>, insoluble WCl<sub>4 </sub>and soluble tungsten species having four chlorine atoms bound to tungsten, [WCl<sub>4</sub>L<sub><i>n</i></sub>] were found to be the main products. The catalytic activity of the respective compounds in ROMP of norbornene was found to decrease in the order: WCl<sub>5 </sub>&gt; WCl<sub>6 </sub>&gt;&gt; WCl<sub>4</sub> ~ [WCl<sub>4</sub>L<sub><i>n</i></sub>]. The polynorbornenes prepared with both WCl<sub>4 </sub>and [WCl<sub>4</sub>L<sub><i>n</i></sub>] possess higher content of <i>cis </i>double bonds in comparison with polymers prepared with WCl<sub>6 </sub>and WCl<sub>5 </sub>catalysts.

Title:Ring Opening Metathesis Polymerization of Norbornene by WCl6: Formation of WCl5 and WCl4 and Their Catalytic Activity
Creators:
Balcar, Hynek
Bastl, Zdeněk
Uncontrolled Keywords:Ring opening metathesis polymerization, Norbornene, Tungsten chlorides
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:61
Number:9
Page Range:pp. 1353-1359
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19961353UNSPECIFIED
ID Code:1040
Item Type:Article
Deposited On:06 Feb 2009 17:06
Last Modified:06 Feb 2009 16:06

Citation

Balcar, Hynek; Bastl, Zdeněk (1996) Ring Opening Metathesis Polymerization of Norbornene by WCl6: Formation of WCl5 and WCl4 and Their Catalytic Activity. Collection of Czechoslovak Chemical Communications, 61 (9). pp. 1353-1359. ISSN 0010-0765

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