| Autor: |
Hirata, Hirotaka, Araki, Takeo, Tani, Hisaya |
| Zdroj: |
Polymer Journal; April 1973, Vol. 4 Issue: 3 p279-289, 11p |
| Abstrakt: |
In the polymerization of isobutyi vinyl ether, Et2AlCl was inactive by itself and highly activated by oxygen. A limited amount of oxygen contacted with Et2AlCl at -78°C gave a stereoregular polymer in a good yield. The catalytically active species was stable only at low temperatures. Iodometrical titration and low temperature IR spectroscopy indicated that the concentration of the active species was proportional to that of the peroxide, e.g., EtAl(OOEt)Cl, a thermally unstable intermediate formed in the course of oxidation of Et2AlCl by oxygen. EtAl(OOCMe2Ph)Cl catalyses the process in a similar fashion to that of the “low temperature Et2AlCl–O2catalyst system.” The oxidation of Et2AlCl and the catalytic activity of the products are studied. The effects of carbon dioxide are reasonably interpreted in terms of the competitive coordination between oxygen and carbon dioxide toward organo-aluminums. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
