Reaction of various 2-acetyl-benzaldehydes with cyclopentadiene in the presence of Fe₃O₄/KCC-1/APTPOSS/salen/Pd(ii) MNPs^a.

Entry	2-Acetyl-benzaldehyde	Product	Yieldb (%)
1			92
2			94
3			89
4			87
5			90
6			91

^aReaction conditions: 2-acetyl-benzaldehyde (10 mmol), cyclopentadiene (70 mmol), and catalyst (6 mg), at room temperature for 3 h.

^bIsolated yields (%).