mpg-C3N4 as a solid base catalyst for Knoevenagel condensations and transesterification reactions
mpg-C3N4 as a solid base catalyst for Knoevenagel condensations and transesterification reactions
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mpg-C3N4 作为 Knoevenagel 缩合和酯交换反应的固体碱催化剂
DOI：
10.1039/c2cy00012a
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发表时间：
2012-01-01
影响因子：
5
通讯作者：
Wang, Xinchen
中科院分区：
文献类型：
--
作者：
Su, Fangzheng;Antonietti, Markus;Wang, Xinchen
采用不同的碱性水溶液（K2 CO 3，KOH，tBuOK）处理所制备的介孔石墨碳氮化物（mpg-C3 N4），得到了去质子化的介孔石墨碳氮化物（mpg-C3 N4）。所得聚合物材料显示出显着增强的碱性，同时保持原始的介孔结构。然后将其用作Knoevenagel缩合和酯交换反应的非均相碱催化剂。催化结果表明，去质子化的mpg-C3 N4表现出高效率的促进这些反应作为一个固体和聚合物催化剂。各种醛与丙二酸衍生物、醇与β-酮酯的反应在去质子化的mpg-C3 N4存在下可以顺利进行。该催化剂可循环使用多次而不损失其固有的催化活性。
Deprotonated mesoporous graphitic carbon nitride (mpg-C3N4) was achieved by a simple method of treatment of as-prepared materials with different basic aqueous solutions (K2CO3, KOH, tBuOK). The resultant polymeric materials show significantly enhanced basicity, while maintaining the original mesoporous structure. It was then used as a heterogeneous base catalyst for Knoevenagel condensations and transesterification reactions. Catalytic results show that the deprotonated mpg-C3N4 exhibits high efficiency for promoting these reactions as a solid and polymeric catalyst. The reactions between various aldehydes and malonic derivatives, alcohols and β-ketoesters could proceed smoothly in the presence of deprotonated mpg-C3N4. The catalyst could be recycled and reused for several runs without any loss of intrinsic catalytic activity.