Journal
POLYCYCLIC AROMATIC COMPOUNDS
Volume 41, Issue 6, Pages 1212-1222Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10406638.2019.1666887
Keywords
Green procedure; heterogeneous catalyst; microwave; Pechmann condensation; silica functionalized-SO3H; solvent-free
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Funding
- Sophisticated Instrumentation Center for Applied Research and Training (SICART)
- University Grants Commission - New Delhi, India
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A novel silica gel functionalized-SO3H catalyst was prepared and used for microwave-assisted solvent-free Pechmann condensation, showing good to excellent yields of 4-methyl coumarin derivatives in a shorter reaction time compared to conventional methods.
A novel silica gel functionalized-SO3H as a heterogeneous catalyst was prepared and characterized by FT-IR, XRD, TGA and elemental analysis. It has been studied for microwave-assisted solvent-free Pechmann condensation. The result revealed that 20% w/w silica bonded 3-mercapto propyl diethylene diamine N-sulfamic acid (SMPDDSA) was found to be effective. 4-methyl coumarin derivatives were the only product obtained in good to excellent yield (75?94%). The present protocol accomplishes the reaction in much lesser time as compared to the conventional method.
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