期刊
CATALYSTS
卷 10, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/catal10040436
关键词
benzimidazole; hafnium chloride; catalysis; activated carbon; parallel synthesis
资金
- National Natural Science Foundation of China [21961013]
- Innovation Foundation of JXSTNU [YC2019-X27]
A highly efficient method for parallel synthesis of a diversity of 1,2-disubstituted benzimidazoles from N-substituted phenylenediamines and aldehydes has been developed by using 10 mol% HfCl4 on activated carbon (HfCl4/C) as the catalyst. The newly reported HfCl4/C catalyst not only mediated fast and clean formation of benzimidazoles but also could be easily removed from the reaction solution and reused up to eight times. Scanning electron microscope (SEM) and thermal desorption studies showed that activated carbon could reversibly adsorb and release Hf(IV) in ethanol upon cooling and heating, thereby serving as a thermal-controlled solid support.
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