Synthesis and characterization of ionic liquid based bifunctional periodic mesoporous organosilica supported potassium carbonate as very efficient nanocatalyst for the Knoevenagel condensation
作者:Dawood Elhamifar、Somayeh Kazempoor
DOI:10.1016/j.molcata.2016.01.001
日期:2016.5
bifunctional periodic mesoporous organosilica supportedpotassiumcarbonate (BPMO-IL-KCO 3 ) is prepared, characterized and its catalytic efficiency is studied in the Knoevenagel reaction. The BPMO-IL-KCO 3 was prepared by chemical attachment of 1-methyl-(3-trimethoxysilylpropyl) imidazolium chloride on an ionic liquid based PMO followed by treatment with potassiumcarbonate under ambient temperature. This material
摘要 制备了一种基于离子液体的新型双功能周期性介孔有机硅负载碳酸钾(BPMO-IL-KCO 3 ),并对其在Knoevenagel反应中的催化效率进行了表征和研究。BPMO-IL-KCO 3 是通过将氯化 1-甲基-(3-三甲氧基甲硅烷基丙基)咪唑鎓化学连接到基于离子液体的 PMO 上,然后在环境温度下用碳酸钾处理来制备的。采用热重分析 (TGA)、能量色散 X 射线 (EDX) 光谱、粉末 X 射线衍射 (PXRD)、扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 对该材料进行了表征。BPMO-IL-KCO 3 随后成功地作为有效的碱催化剂应用于不同醛与氰基乙酸乙酯的 Knoevenagel 缩合反应,并获得了高收率的相应偶联产物。催化剂被回收并重复使用数次,活性和选择性没有显着降低。回收的催化剂还通过 TEM 和氮吸附实验进行分析,以研究材料在应用条件下的结构稳定性和耐久性。
Sidhu, Anjali; Rai, Mangat, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2008, vol. 47, # 5, p. 778 - 780
作者:Sidhu, Anjali、Rai, Mangat
DOI:——
日期:——
Simple, Efficient, and Green Method for Synthesis of Trisubstituted Electrophilic Alkenes Using Lipase as a Biocatalyst
Abstract A simple and efficient Knoevenagelcondensationmethod for the synthesis of trisubstituted electrophilic alkenes was developed using lipase as a biocatalyst. Knoevenagelcondensation was performed using the conventional method and using lipases (Aspergillus oryzae or Rhizopus oryzae) as biocatalysts, and reaction time, reaction temperature, yield, and recyclability were compared. Using a lipase