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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Janssen, Annette Sypien, Jakub Dinjus, Eckhard Zevaco, Thomas A. |
| Copyright Year | 2005 |
| Abstract | Aluminium triisopropoxide, a versatile and cheap oligomeric Lewis acid catalyst, easily reacts with carbon dioxide to build complex oligomeric aluminium alkoxo-alkylcarbonato compounds. A first series of experiments with cyclohexene oxide and CO2 showed that the catalyst is highly active in the copolymerisation with carbon dioxide and that a satisfactory carbon dioxide insertion takes place when the reaction is run at temperatures between 50 and 80 °C and pressures around 100 bar CO2. High yields of polyether-carbonates can be obtained (up to 1000 g of copolymer per g aluminium) with molecular weight up to 11 000 g mol−1 and a better selectivity of the CO2-insertion than other aluminium trialkoxides (carbonate to ether linkages ratio: 1 to 3). On the basis of 27Al-NMR spectra it can be seen that the high reactivity of the catalyst is due to a rearrangement of the stable tetrameric aluminium isopropoxide in a more reactive oligomer and, most likely, during the copolymerisation, to a further fragmentation into reactive monomeric species. |
| Starting Page | 659 |
| Ending Page | 666 |
| Page Count | 8 |
| File Format | HTM / HTML PDF |
| ISSN | 14639262 |
| Volume Number | 7 |
| Issue Number | 9 |
| Journal | Green Chemistry |
| DOI | 10.1039/b504798f |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Subscribed |
| Subject Keyword | Lewis Carboxylic acid Carbon dioxide Aluminium Cyclohexene oxide Copolymer Ether Aluminium isopropoxide Oligomer |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Pollution |
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