elemental mapping analysis. The catalytic performance of the novel hydrogen-bonding catalyst was appropriately probed through the multicomponent preparation of bipyridine-5-carbonitriles via a cooperative vinylogous anomeric based oxidation (CVABO) mechanism in the absence of any solvent. The novel hydrogen-bonding nanomagnetic catalyst can readily be regained and reused four times without appreciable
制备了Fe 3 O 4 @SiO 2 @(CH 2)3-
脲硫脲作为新型的氢键可回收纳米磁性催化剂,并通过透射电子显微镜(
TEM),热重分析/导数热重分析(TGA / DTG)证实了其结构。 ),振动样品磁力计(VSM),傅立叶变换红外(FT-IR)光谱,场发射扫描电子显微镜(FE
SEM),能量色散光谱(EDS)和元素图分析。新型氢键催化剂的催化性能可以通过联
吡啶5-腈的多组分制备进行考察。在不存在任何溶剂的情况下,基于
乙烯基异氰酸酯的协同氧化(CVABO)机理。新型氢键结合的纳米磁性催化剂可以很容易地获得并重复使用四次,而不会明显破坏催化效率。