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On the mechanism of ring-opening polymerization of cyclo-olefins

โœ Scribed by B.A. Dolgoplosk; K.L. Makovetsky; T.G. Golenko; Yu.V. Korshak; E.I. Tinyakova

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
296 KB
Volume
10
Category
Article
ISSN
0014-3057

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โœฆ Synopsis

From experimental data, a conclusion is drawn on chain character of cyclo-olefin ring-opening polymerization. It was suggested that the active centres of this process are carbene complexes of transition metals (W, Mo, Re). The confirmation of this view comes from studies on the initiation of ring-opening polymerization by complexes of tungsten chlorides with phenylcarbene. The latter is formed in the coordination sphere of tungsten by decomposition of phenyl diazomethane.

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A novel, metal alkyl-free catalyst for t
A novel, metal alkyl-free catalyst for the ring-opening polymerization of cyclo-olefins
โœ P.R. Marshall; B.J. Ridgewell ๐Ÿ“‚ Article ๐Ÿ“… 1969 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 249 KB

Abstraet--Cyclo-olefins may be polymerized under very mild conditions to give linear polymers using a mixture of WCI6 and A1Br3. No metal alkyls are involved. The polymers contain no vinylic unsaturation. \* Commercial product, 60 per cent trans, 30 per cent cis, I0 per cent saturated material. t T

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