Journal
CHINESE JOURNAL OF CATALYSIS
Volume 36, Issue 9, Pages 1606-1613Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(15)60910-X
Keywords
Acid catalysis; Solid acid; Policresulen; Covalent bond-free immobilization; oxa-Pictet-Spengler reaction
Funding
- National Natural Science Foundation of China [21173089, 21373093]
- Fundamental Research Funds for the Central Universities of China [2014ZZGH019]
- Cooperative Innovation Center of Hubei Province
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A new type of solid catalyst was prepared by coating a thin layer of policresulen, an inexpensive polymer prepared via condensation of 2-hydroxy-4-methylbenzenesulfonic acid and formaldehyde that has been used as commercially available drug, onto the surface of silica. The policresulen component is insoluble in many organic solvents and can be adsorbed on silica with the aid of hydrogen bonding. The obtained silica/policresulen composite showed remarkable catalytic activity for various organic reactions. In model reactions, the catalyst can be recycled several times without significant loss of activity. The salient features of using this acid catalyst in organic reactions include cost-effectiveness, simple and time-efficient preparation, and the convenience of controlling the acid loading on the solid. (C) 2015, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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