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首页> 外文期刊>RSC Advances >Acid and base catalysed reactions in one pot with site-isolated polyHIPE catalysts
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Acid and base catalysed reactions in one pot with site-isolated polyHIPE catalysts

机译：一锅中与酸和碱的催化与现场分离的polyHIPE催化剂的反应

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The polyHIPE catalysts based on styrene, vinyl benzyl chloride, and divinylbenzene co-polymerisation were functionalised with carboxylic and tertiary amine groups. Catalyst characterisation showed covalent bonding of the graft polymers. The macroporous and highly interconnected structure of polyHIPEs allows isolation of the acid and base functional groups and allows the presence of these otherwise incompatible functionalities on the same catalyst. The functionalised polyHIPE catalysts were shown to perform two reactions; (i) acid-catalysed acetal hydrolysis and (ii) base-catalysed Knoevenagel condensation in one-pot with 97% yield. The yield obtained is substantially higher than that observed with the homogeneous or resin polymer type catalysts due to the compartmentalisation of the active sites and improved mass transfer through the open porous polyHIPE structure.
机译：将基于苯乙烯，乙烯基苄基氯和二乙烯基苯共聚的polyHIPE催化剂用羧基和叔胺基团官能化。催化剂表征显示了接枝聚合物的共价键合。聚HIPE的大孔且高度互连的结构允许酸和碱官能团的分离，并允许在同一催化剂上存在这些原本不相容的官能团。官能化的polyHIPE催化剂显示出可进行两个反应。 （i）酸催化的乙缩醛水解和（ii）碱催化的Knoevenagel缩合反应，一锅法，收率97％。由于活性部位的分隔和通过开孔的多孔HIPE结构的传质改善，所获得的产率基本上高于用均相或树脂聚合物型催化剂观察到的产率。

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