Novel synthesis of spacer‐modified polymer supports and activity of phase‐transfer catalysts derived from the polymer supports
Novel synthesis of spacer‐modified polymer supports and activity of phase‐transfer catalysts derived from the polymer supports
复制标题
间隔基改性聚合物载体的新合成及其衍生的相转移催化剂的活性
DOI：
10.1002/pol.1982.170201028
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
H. Kakiuchi
中科院分区：
文献类型：
--
作者：
M. Tomoi;Eijiro Ogawa;Y. Hosokawa;H. Kakiuchi
氯甲基化聚苯乙烯树脂可用于制备聚合物载体试剂或催化剂。然而，固定化催化剂的活性往往低于可溶性催化剂。2此外，由氯甲基化聚苯乙烯衍生的催化剂在各种条件下并不总是稳定的，因为存在苯基键：例如，苯基乙基3和磷酸盐分别在酸性和碱性条件下分解。最近，在催化段和聚苯乙烯主链之间引入间隔臂来改善这些缺点。^在大多数情况下，具有间隔活性基团的固定化催化剂是由由聚苯乙烯与二乙烯基苯交联制备的间隔改性聚合物载体合成的。这些催化剂含有催化基团以外的官能团，纯度较低。高纯度的催化剂可以由含有所需官能团的聚合物载体制备。本文报道了用w-溴烷基苯乙烯聚合法制备间隔层改性聚合物载体，并对聚合物载体的相转移催化剂的活性进行了研究。
Chloromethylated polystyrene resins are useful for the preparation of polymer-supported reagents or catalysts.'The activity of immobilized catalysts, however, is often less than that of soluble catalysts. 2 Moreover, the catalysts derived from chloromethylated polystyrene are not always stable under various conditions because of the presence of benzylic linkages: for example, benzylic ethel3 and phosphonium salt4 decomposed under acidic and basic conditions, respectively. Recently, the introduction of a spacer arm between the catalytic moiety and the polystyrene backbone was carried out to improve these disadvantage^.^.^ In most cases immobilized catalysts with spaced active groups are synthesized from spacer-modified polymer supports prepared via steps from polystyrene crosslinked with divinylbenzene. These catalysts contain functional groups other than the catalytic group and are in a low state of purity. Catalysts in a high state of purity can be prepared from polymer supports that contain the required functional group. In this article we report on the preparation of spacer-modified polymer supports by the polymerization of w-bromoalkylstyrene and on the activity of phase-transfer catalysts derived from polymer supports.