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Polymer-supported phosphoric triamides as catalysts for phase-transfer reactions

โœ Scribed by M. Tomoi; M. Ikeda; H. Kakiuchi

Publisher
Elsevier Science
Year
1978
Tongue
French
Weight
142 KB
Volume
19
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

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 supports were found to catalyze the two-

๐Ÿ“œ SIMILAR VOLUMES

Polymer-supported cryptands as catalysts
Polymer-supported cryptands as catalysts for phase-transfer reactions
โœ M. Tomoi; K. Kihara; H. Kakiuchi ๐Ÿ“‚ Article ๐Ÿ“… 1979 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 137 KB

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.

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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

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Spacer-modified polymer supports have been synthesized through the polymeric Grignard reagent method. Phosphonium-active sites were then introduced into these supports and the polymer-supported phosphonium salts were used as phase transfer catalysts for the nucleophilic substitution reactions. lnflu