The effect of solvent and temperature for synthesis of pentafulvene^a.

Entry	Solvent	Temp. (°C)	Yieldb (%)
1	DMF	Reflux	80
2	DMF	130	85
3	DMF	110	92
4	DMF	90	92
5	DMF	70	92
6	DMF	50	92
7	DMF	r.t.	92
8	DMSO	r.t.	74
9	Dioxane	r.t.	82
10	CH3CN	r.t.	69
11	CH2Cl2	r.t.	77
12	EtOAc	r.t.	82
13	THF	r.t.	74
14	Toluene	r.t.	69
15	CHCl3	r.t.	77
16	n-Hexane	r.t.	21
17	Benzene	r.t.	17
18	CCl4	r.t.	15
19	Cyclohexane	r.t.	10
20	H2O	r.t.	29
21	EtOH	r.t.	21
22	i-PrOH	r.t.	32
23	MeOH	r.t.	18
24	Solvent-free	r.t.	—

^aReaction conditions: 2-acetyl-benzaldehyde (10 mmol), cyclopentadiene (70 mmol), and nano Fe₃O₄/KCC-1/APTPOSS/salen/Pd(ii) MNPs (6 mg), and solvent (10 mL), 3 h.

^bGC yields [%].