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| Entry | Catalyst (g) | Power | Time (min) | Yield (%) |
|---|---|---|---|---|
| 1 | Sulfosalicylic acid (0.01) | 180 | 15 | 75 |
| 2 | FeCl3·6H2O (0.05) | 180 | 15 | 43 |
| 3 | Bulk-Fe3O4 (0.05) | 180 | 15 | 50 |
| 4 | Nano-Fe3O4 (0.05) | 180 | 15 | 68 |
| 5 | Fe3O4@sulfosalicylic acid (0.03) | 180 | 20 | 89 |
| 6 | Fe3O4@sulfosalicylic acid (0.03) | 300 | 10 | 92 |
| 7 | Fe3O4@sulfosalicylic acid (0.05) | 100 | 10 | 89 |
| 8 | Fe3O4@sulfosalicylic acid (0.05) | 180 | 10 | 96 |
| 9 | Fe3O4@sulfosalicylic acid (0.08) | 180 | 10 | 96 |
| 10 | Fe3O4@sulfosalicylic acid (0.015) | 180 | 10 | 80 |
| 11 | — | 180 | 20 | 30 |
