使用一系列复杂的分析技术,例如BET,XRD,HRTEM,EDX,29 Si MAS NMR,TGA,FTIR和pH测量,合成并表征了一种新型的均相MCM-41二氧化硅负载型HPF 6催化剂。通过高度取代的1,4-二氢吡啶(1,4-DHP)的文库合成,探索了二氧化硅-HPF 6的广泛适用性。1,4-DHPs被H 2 O 2水溶液进一步氧化为吡啶作为化学计量的氧化剂,被认为是一种丰富的绿色氧化剂。吡啶自发产生低分子量的自聚集有机物质(LMSOM)。据报道它们的一维堆积和有趣的光物理性质。使用水作为溶剂进行合成对于其可持续的绿色影响至关重要。此外,二氧化碳和水是唯一的副产物,这增加了它的吸引力。该二氧化硅-HPF 6催化剂即使暴露于环境气氛10天后仍保持其活性。
A new MCM-41 supported HPF6 catalyst for the library synthesis of highly substituted 1,4-dihydropyridines and oxidation to pyridines: report of one-dimensional packing towards LMSOMs and studies on their photophysical properties
a library synthesis of highly substituted 1,4-dihydropyridines (1,4-DHPs). The 1,4-DHPs are further oxidized to pyridines with aqueous H2O2 as stoichiometric oxidant which is considered as an abundant and green oxidant. The pyridines spontaneously generate low molecular mass self-aggregated organic materials (LMSOMs). Their one-dimensional packing and interesting photophysical properties are reported
使用一系列复杂的分析技术,例如BET,XRD,HRTEM,EDX,29 Si MAS NMR,TGA,FTIR和pH测量,合成并表征了一种新型的均相MCM-41二氧化硅负载型HPF 6催化剂。通过高度取代的1,4-二氢吡啶(1,4-DHP)的文库合成,探索了二氧化硅-HPF 6的广泛适用性。1,4-DHPs被H 2 O 2水溶液进一步氧化为吡啶作为化学计量的氧化剂,被认为是一种丰富的绿色氧化剂。吡啶自发产生低分子量的自聚集有机物质(LMSOM)。据报道它们的一维堆积和有趣的光物理性质。使用水作为溶剂进行合成对于其可持续的绿色影响至关重要。此外,二氧化碳和水是唯一的副产物,这增加了它的吸引力。该二氧化硅-HPF 6催化剂即使暴露于环境气氛10天后仍保持其活性。
Copper incorporated nanorod like mesoporous silica for one pot aerobic oxidative synthesis of pyridines
Copper incorporated nano-rod like mesoporous silica catalyst was synthesized, characterized by N-2 adsorption, HRTEM-EDX, XRD, AAS, XPS and TPD-NH3 analyses and applied in the one-pot aerobic oxidative synthesis of highly substituted pyridines. Both the enhanced surface acidity of copper incorporated silica and the redox property were essential for pyridine synthesis. Standard leaching experiment proved that the reaction was heterogeneous. (C) 2014 Elsevier B.V. All rights reserved.