| Autor: |
Warren T. Ford, Altaf E. Qureshi |
| Rok vydání: |
1989 |
| Předmět: |
|
| Zdroj: |
Reactive Polymers. 10:279-285 |
| ISSN: |
0923-1137 |
| DOI: |
10.1016/0923-1137(89)90035-3 |
| Popis: |
The methyl groups of soluble and 1% crosslinked poly(p-methylstyrene) were chlorinated in mixtures of chloroform and aqueous sodium hypochlorite that was neutralized to pH 8.4 with HCl, both in the presence and in the absence of the phase-transfer catalyst (PTC) benzyltriethylammonium chloride. With 0.6–1.8 mol of hypochlorite and 0.01–0.02 mol of PTC per polymer repeat unit at room temperature a degree of functionalization (DF) of 0.10–0.6 of chloromethyl groups was attained. Similarly, bromination of 1% crosslinked poly(p-methylstyrene) with sodium hypobromite solution that was neutralized to pH 8.4 with HBr proceeded without any PTC to give a DF of 0.15–0.37 of bromomethyl groups. Selected chloromethyl polymers were esterified with the cesium salts of Boc- l -valine and Boc- l -phenylalanine. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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