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The gelatinous and macroporous phase-transfer c atalysts with multiple active centers were synthesized by means of quarterisatio n of PEG tertiary amine and chloromethylated St-DVB copolymer. They were examin ed as phase-transfer catalysts in the reaction of n-C8H17Br with s olid NaI. The experimental results showed that the reaction rate was first-orde r with respect to the concentration of n-C8H17Br. The effects of ca talyst structure on the catalytic activity were also investigated. The observed reaction rate constant (kobsd) increased as the degree of cross-linki ng of polymer decreased. Macroporous catalysts showed a higher activity (2~2.5 times) than that of microporous catalysts with the same degree of cross-linkin g of polymer, particle size and amount of supported PEG. Molecular weight of PEG also showed much influence on kobsd. As molecular weight of PEG rose properly, the catalysts showed a higher activity. The results were discussed fro m the aspect of triphase catalysis reaction mechanism.

参考文献

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[16] 路亦景.[J].日用化学工业,1989(06):282.
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[19] 梁逊.聚苯乙烯固载化聚乙二醇苄醚的合成、相转移催化及机理研究[J].高等学校化学学报,1989(06):623-628.
[20] 金松寿;黄宪 .[J].分子科学与化学研究,1985,5(02):159.
[21] Kimura Y;Regen S L .[J].Journal of Organic Chemistry,1983,48(02):195.
[22] Regen S L .[J].Journal of the American Chemical Society,1975,97(20):5956.
[23] Cinouini M;Colonna S;Molinari H.[J].Journal of the Chemical Society,Chemical Communications,1976(11):394.
[24] Brown J M;Jenkins J A.[J].Journal of the Chemical Society,Chemical Communications,1976(12):458.
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