NDLI: Studies on the copolymerization of norbornene with CO catalyzed by a new catalytic system PdCl$_{2}$/phen/M(CF$_{3}$SO$_{3}$)$

Content Provider	Springer Nature Link
Author	Li, L. Huang, X. L. Wang, Zh. Li, G. X.
Copyright Year	2007
Abstract	A new three-component catalytic system, PdCl$_{2}$/phen/M(CF$_{3}$SO$_{3}$)$_{n}$ where M = La, Y, Yb, Zn, and Cu, was studied for the copolymerization of norbornene (NBE) with CO to prepare polyketone (PK). It was found that the CF$_{3}$SO$_{3}$H catalytic system gave a low catalytic activity for the copolymerization of norbornene with CO, but when M(CF$_{3}$SO$_{3}$)$_{n}$ was introduced instead of CF$_{3}$SO$_{3}$H, the PdCl$_{2}$/phen/M(CF$_{3}$SO$_{3}$)$_{n}$ catalytic system exhibited much higher activity. The effects of ligands, M(CF$_{3}$SO$_{3}$)$_{n}$, solvents, and temperatures on the copolymerization have been discussed in detail. The results showed that with 1,10-phenanthroline (phen) and Cu(CF$_{3}$SO$_{3}$)$_{2}$ used as cocatalysts, the corresponding reaction rate reached 82 000 g PK (mol Pd)$^{−1}$h$^{−1}$ when the reaction was carried out in methanol at 90°C and 3.0 MPa of CO, and the weight average molecular weight (M $_{w}$) of the resultant copolymer is 1090 g/mol. The copolymer was characterized with various techniques such as FT-IR, $^{1}$HNMR, $^{13}$CNMR, TGA, and DSC. The infrared spectrum of the product includes two features at 1697 and 1732 cm$^{−1}$ for the NBE/CO copolymer in CH$_{3}$OH that are attributed to carbonyl groups in ketones (repeating unit) and esters (end group), respectively. Due to the tension of the ring of norbornene, the degree of copolymerization is not high.
Starting Page	45
Ending Page	52
Page Count	8
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	48
Issue Number	1
e-ISSN	16083210
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2007-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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