期刊
ACS CATALYSIS
卷 7, 期 5, 页码 3693-3702出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b03631
关键词
hollow sphere; hyper-cross-linked polymers (HCPs); water-stable; bifunctionalized catalyst; cyclohexenone; tandem reactions
资金
- National Natural Science Foundation of China [21373093, 21474033, 21473064, 51273074]
- Analytical and Testing Center of HUST
- Fundamental Research Funds for the Central Universities of China [2014ZZGH019]
A task-specific functionalized hyper-cross linked polymer (HCP) with hollow spherical structure was synthesized by an easily accessible Friedel-Crafts reaction based approach. A harmonious coexistence of acid (sulfonic acid) and base (amine) sites on a microporous organic material was achieved. The acid base bifunctional HCP catalyst (HCP-A-B) structure was fully characterized by many physicochemical methods. In the subsequent tandem reactions (hydrolysis/Henry and hydrolysis/Knoevenagel reactions), the HCP-A-B catalyst displayed high catalytic efficiency and chemical stability toward water or organic solvent. These HCP-A-B catalyst characteristics led to the development of a previously unreported transformation of 2-ethoxy-3,4-dihydropyran derivative to a 2-cyclohexen-1-one derivative through a tandem reaction involving water-assisted ring opening hydrolysis of the dihydropyran, an intramolecular aldol reaction, and a dehydration reaction. In all of these reactions, the bifunctional HCP-A-B catalyst can be recovered and reused more than 10 times without significant loss of activity.
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