Citation: Khodabakhsh Niknam, Dariush Saberi, Mojtaba Baghernejad. Silica-bonded S-sulfonic acid a recyclable catalyst for the synthesis of coumarins[J]. Chinese Chemical Letters, ;2009, 20(12): 1444-1448. doi: 10.1016/j.cclet.2009.06.039
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Silica-bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acidin chloroform.This solid acid has been employed as a recyclable catalyst for the synthesis of coumarins from phenols and β-ketoesters at 80 ℃ under solvent-free conditions.
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Keywords:
- Silica-bonded S-sulfonic acid,
- Coumarins,
- Solvent-free,
- Phenols,
- β-Keto-esters
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