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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Tungstic acid functionalized mesoporous SBA-15: A novel heterogeneous catalyst for facile one-pot synthesis of 2-amino-4H-chromenes in aqueous medium
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Tungstic acid functionalized mesoporous SBA-15: A novel heterogeneous catalyst for facile one-pot synthesis of 2-amino-4H-chromenes in aqueous medium

机译：钨酸官能化的中孔SBA-15：一种新型多相催化剂，用于在水介质中方便地一锅合成2-氨基-4H-色烯

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摘要

A new highly ordered mesoporous tungstic acid functionalized SBA-15, TAFMC-1 has been synthesized via post-synthesis modification of mesoporous SBA-15 with (3-chloropropyl) triethoxysilane followed by substitution reaction of chlorine atom of the 3-chloropropyl group by tungstic acid group under refluxing conditions in n-hexane. The tungstic acid functionalized mesoporous silica material has been characterized by using small angle powder X-ray diffraction, N_2 sorption, HR-TEM, FE-SEM, FT-IR and solid state MAS NMR studies. TAFMC-1 catalyzes the facile one-pot catalytic three-component condensation reaction of resorcinol, aromatic aldehyde and malononitrile for the synthesis of a diverse range of 2-amino-4H-chromenes in aqueous medium. This heterogeneous catalyst can be recycled very efficiently for six consecutive reaction cycles without significant loss of catalytic activity.
机译：通过用（3-氯丙基）三乙氧基硅烷对介孔SBA-15进行后合成修饰，然后用钨取代3-氯丙基的氯原子，合成了一种新的高度有序的介孔钨酸官能化SBA-15，TAFMC-1。在正己烷中回流条件下的酸基团。通过使用小角度粉末X射线衍射，N_2吸附，HR-TEM，FE-SEM，FT-IR和固态MAS NMR研究，对钨酸官能化的介孔二氧化硅材料进行了表征。 TAFMC-1催化间苯二酚，芳族醛和丙二腈的便捷的一锅催化三组分缩合反应，用于在水性介质中合成各种范围的2-氨基-4H-色烯。这种非均相催化剂可以非常有效地循环使用六个连续的反应周期，而不会显着降低催化活性。

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