壳聚糖作为可再生多相催化剂,在离子液体中作为绿色溶剂进行knoevenagel反应。

ISRN Organic Chemistry Pub Date : 2012-07-17 eCollection Date: 2012-01-01 DOI:10.5402/2012/928484
Nam T S Phan, Ky K A Le, Thien V Nguyen, Nhan T H Le
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引用次数: 13

摘要

将壳聚糖作为可再生多相催化剂,离子液体作为“绿色”溶剂进行Knoevenagel反应。采用x射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、热重分析(TGA)、傅里叶变换红外光谱(FT-IR)和元素分析等方法对壳聚糖催化剂进行了表征。在温和的条件下实现了优异的转化,而不需要惰性气氛。浸出的活性物质没有贡献,只有在固体催化剂存在的情况下才有可能转化。壳聚糖催化剂和离子液体溶剂在反应中使用后都可以以基本纯净的形式回收,并且都可以多次重复使用而效率没有明显下降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Chitosan as a renewable heterogeneous catalyst for the knoevenagel reaction in ionic liquid as green solvent.

Chitosan as a renewable heterogeneous catalyst for the knoevenagel reaction in ionic liquid as green solvent.

Chitosan as a renewable heterogeneous catalyst for the knoevenagel reaction in ionic liquid as green solvent.

Chitosan as a renewable heterogeneous catalyst for the knoevenagel reaction in ionic liquid as green solvent.

The combination of chitosan as a renewable heterogeneous catalyst and ionic liquid as a "green" solvent was employed for the Knoevenagel reaction. The chitosan catalyst was characterized by various techniques, including X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), and elemental analysis. Excellent conversions were achieved under mild conditions without the need for an inert atmosphere. There was no contribution from leached active species, and conversion was only being possible in the presence of the solid catalyst. The chitosan catalyst as well as the ionic liquid solvent could be recovered in essentially pure form after being used in the reaction, and each of them could be reused several times without a significant degradation in efficiency.

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