Novel and sustainable synthesis of tetrahydrobenzo[b]pyrans using magnetic zinc ferrites modified SBA-15 supported ionic liquids as efficient and reusable catalysts
Novel and sustainable synthesis of tetrahydrobenzo[b]pyrans using magnetic zinc ferrites modified SBA-15 supported ionic liquids as efficient and reusable catalysts
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DOI：
10.1016/j.scp.2022.100779
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发表时间：
2022-07-09
影响因子：
6
通讯作者：
Rong, Qi
中科院分区：
文献类型：
--
作者：
Hu, Yu Lin;Li, Jing Rui;Rong, Qi
合成了一系列磁性铁酸锌改性的SBA-15负载离子液体，并评价了其作为水介质中等摩尔量醛、丙二腈和1，3-环己二酮多组分反应的有效催化剂。磁性负载离子液体中的大多数在反应中表现出良好的效果，尤其是Zn（0.2）Ee（2.8）O（4）@SBA-15（0.5）@CH3COO（0.2）和Zn（0.2Fe2.8O4）@ SBA-15（0.5）。(5)@ILCH3COO（0.3）.结果表明，Zn0.2Fe2.8O4@SBA-15（0. (5)@CH3COO（0.2），其含有协同作用的铁酸锌和离子液体活性中心，在室温下以高至优异的产率有效且选择性地产生相应的四氢苯并[B]吡喃。该催化剂具有良好的稳定性，可重复使用6次，催化活性无明显下降。绿色反应条件、易于后处理、可行性、更清洁的反应曲线、简单的纯化、催化剂的可持续和稳定的可回收性是本方案的一些优点。
A series of magnetic zinc ferrites modified SBA-15 supported ionic liquids has been synthesized and evaluated as effective catalysts for the one-pot multi-component reaction of equimolar amounts of aldehydes, malononitrile and 1,3-cyclohexanedione in aqueous medium. Most of these magnetic supported ionic liquids showed good results in the reaction, especially the catalysts Zn(0.2)Ee(2.8)O(4)@SBA-15(0.5)@CH3COO(0.2) and Zn0.2Fe2.8O4@SBA-15(0.)(5)@ILCH3COO(0.3). The most active and suitable catalyst was the catalyst Zn0.2Fe2.8O4@SBA-15(0.)(5)@CH3COO(0.2), which containing synergestic zinc ferrites and ionic liquid active sites effect and can efficiently and selectively produce the corresponding tetrahydrobenzo[b]pyrans in high to excellent yields at room temperature. Moreover, the catalyst exhibited excellent stability and could be easily recovered and reused for six times without a considerable decrease in catalytic activity. Green reaction conditions, ease work-up, feasibility, cleaner reaction profile, simple purification, sustainable and stable recyclability of catalyst are some advantages of the present protocol.