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Chitosan as a biodegradable heterogeneous catalyst for Knoevenagel condensation for benzaldehydes and ethylcyanoacetamide
Catalysis Communications ( IF 3.7 ) Pub Date : 2020-02-06 , DOI: 10.1016/j.catcom.2020.105954
Nagaraj Anbu , Raju Maheswari , Vimali Elamathi , Perumal Varalakshmi , Amarajothi Dhakshinamoorthy

A natural biopolymer chitosan is being employed as heterogeneous solid base catalyst for the Knoevenagel condensation reaction between benzaldehyde and cyanoacetamide under mild reaction conditions. This reaction offers the direct synthesis of condensation product with two functional groups that can readily be functionalized. The biopolymer is used for five cycles with no decrease in activity and hot filtration test proves heterogeneity of the reaction. Some of the salient features of this strategy include biodegradability of catalyst, high catalyst stability, mild reaction conditions and wide substrate scope. The structural integrity is retained even after repeated cycles as evidenced by powder X-ray diffraction (XRD).



中文翻译:

壳聚糖作为可生物降解的均相催化剂,用于苯甲醛和乙基氰基乙酰胺的Knoevenagel缩合反应

天然生物聚合物壳聚糖被用作多相固体碱催化剂,用于在温和的反应条件下苯甲醛和氰基乙酰胺之间的Knoevenagel缩合反应。该反应提供具有两个官能团的缩合产物的直接合成,所述两个官能团可以容易地被官能化。该生物聚合物用于五个循环而没有活性降低,并且热过滤测试证明了反应的异质性。该策略的一些显着特征包括催化剂的生物降解性,高催化剂稳定性,温和的反应条件和广泛的底物范围。粉末X射线衍射(XRD)证明,即使经过反复循环,结构完整性也得以保留。

更新日期:2020-02-07
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