Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 14, Issue 4, Pages 1302-1310Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ob01953b
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- Burapha University through a National Research Council of Thailand [29/2555, 17/2556]
- Thailand Research Fund [TRG5780298]
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A mild, efficient and metal-free method was described for the green synthesis of dipyrromethanes from aldehydes and unsubstituted pyrrole catalyzed by SO3H-functionalized ionic liquids (SO3H-ILs) in aqueous media at room temperature. Notably, SO3H-ILs, 1-butylsulfonic-3-methylimidazolium hydrogen sulfate ([bsmim][HSO4]) was the most efficient catalyst for moderate to good yields of the corresponding desired products.
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