Abstract

4-Chloro-2,6-pyridinedicarboxylic acid (CPDA) functionalized mesoporous silica SBA-15 nanocomposites (SBA/5CPDA) were synthesized and characterized for the Knoevenagel condensation of syringaldehyde and acetaldehyde to synthesize sinapaldehyde in the liquid phase. The physicochemical characterization of the SBA/CPDA nanocomposites showed the decrease in the surface properties (surface area, pore size, pore volume) compared to SBA-15 confirming the complete functionalization of CPDA inside the mesopores of SBA-15 materials. The catalytic activity results displayed high activity (~90%) and selectivity (90–95%) of the desired product (sinapaldehyde) under environmental friendly conditions. All the reaction parameters were optimized to accomplish the maximum conversion of the selective products. Finally, the mechanism of the formation of the products was proposed and discussed.

中文翻译：

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4-氯-2,6-吡啶二甲酸功能化介孔二氧化硅纳米复合材料的合成水杨醛

摘要

合成了4-氯-2,6-吡啶二羧酸（CPDA）功能化的介孔二氧化硅SBA-15纳米复合材料（SBA / 5CPDA），并对其在丁烯醛和乙醛的Knoevenagel缩合反应进行了表征，以合成液相中的芥子醛。与SBA-15相比，SBA / CPDA纳米复合材料的理化特性显示其表面性能（表面积，孔径，孔体积）下降，从而证实了CPDA在SBA-15材料的中孔内已完全功能化。催化活性结果表明，在环境友好的条件下，所需产物（五聚甲醛）具有较高的活性（约90％）和选择性（90-95％）。优化所有反应参数以实现选择性产物的最大转化。最后，