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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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可调苯氧基修饰的聚(苯乙烯-苯乙烯基膦酸)-磷酸氢锆固载手性MnⅢ(Salen)高效催化烯烃环氧化
DOI: 10.1016/S1872-2067(14)60064-4, PP. 1446-1455
Keywords: 聚(苯乙烯基-苯乙烯膦酸)-磷酸氢锆,手性Jacobsen催化剂,可调变苯氧链接基团,不对称非均相环氧化
Abstract:
？使用不同空间位阻的苯氧链接手臂修饰的聚（苯乙烯基-苯乙烯膦酸）-磷酸氢锆轴向固载手性MnⅢ（Salen）催化剂（Cat1-Cat3），随后在间氯过氧苯甲酸（m-CPBA）为氧化剂的体系中考察了固载催化剂的催化性能.同时，在相同氧化体系下测试了一系列均相催化剂类似物（Cat4-Cat6）.结果表明，在非均相条件下，可调变苯氧链接手臂的邻位取代基对催化剂活性起着重要作用，环氧化产物的对映选择性随着取代基位阻的增加而增大，但产物转化率有一定程度下降.此外，非均相催化剂即使在没有轴向助剂的参与下（通常需要添加，为了增大催化活性）仍然表现出非常高的催化活性，尤其对α-甲基苯乙烯反应，其对映选择性从6.8%增加到76.8%，转化率从19.8%上升到90.7%.制备的非均相催化剂11次的循环使用实验表明，在前5次使用后催化剂活性与对映选择性没有明显变化.
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