Polymer-supported cryptands were prepared by the reaction of hydroxyl-containing cryptands and chloromethylated polystyrene resin. The polymer-supported cryptands were effective catalysts for aqueous organic two-phase reactions.
Optimization of polymer-supported oligoethers as solid-liquid phase transfer catalysts
โ Scribed by J.G. Heffernan; D.C. Sherrington
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- French
- Weight
- 233 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
Summa'ry. Oligoether residues with terminal 8-quinolyl donor groups have been loaded virtually quantitatively onto polystyrene resin supports and function more effectively than dibenzo-18-crown-6 as solid/liquid phase transfer catalysts in Williamson ether syntheses.
Oligoethylene oxide species are known to be useful and cheap phase transfer catalysts and their practical applicability can be improved by supporting them on polystyrene resins2 when they function similarly to other 'triphase' catalysts'
๐ SIMILAR VOLUMES
Aqueous organic two-phase reactions are known to be catalyzed by quarternary ammonium or phosphonium salts, 1) crown ethers, 2) cryptands, 3) d-phosphoryl sulfoxides, 4) and phosphoric triamides. 5,6) Recently, the onium salts, 7-10) crown ethers, S,9,11) and cryptands\*) immobilized on polymer sup