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.
Polytriazinylstyrene-supported oligo(oxyethylene)s as phase transfer catalysts
β Scribed by Shuji Kondo; Takashi Yamamoto; Masahito Mase; Hidenobu Mikami; Hideo Kunisada; Yasuo Yuki
- Publisher
- Elsevier Science
- Year
- 1994
- Weight
- 413 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0923-1137
No coin nor oath required. For personal study only.
π 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
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
Coupling of substituted halobenzenes to the respective biphenyls is effected with high selectivity in toluene, using a combination of a reducing agent and a weak base in the presence of catalytic tetrabutylammonium bromide (TBAB) and palladium that are both supported on carbon. The maximum selectivi