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| Entry | Catalyst | Yieldb (%) |
|---|---|---|
| 1 | KCC-1 | — |
| 2 | Fe3O4/KCC-1/APTPOSS | — |
| 3 | Fe3O4/KCC-1/APTPOSS/salen/Pd(ii) | 92 |
| 4 | Nano-SiO2/salen/Pd(ii) | 53 |
| 5 | MCM-41/salen/Pd(ii) | 74 |
| 6 | SBA-15/salen/Pd(ii) | 80 |
| 7 | Salen/Pd(ii) | 83 |
Reaction conditions: 2-acetyl-benzaldehyde (10 mmol), cyclopentadiene (70 mmol), and catalyst (6 mg), at room temperature for 3 h.
Isolated yield.
