Table 3. Effect of different catalysts on the reaction of 2-naphthol and benzaldehyde^a.

Entry	Catalyst	Yield (%)b
1.	Graphite	10
2.	GO	20
3.	CuFe2O4 nanoparticle	72
4.	GO/CuFe2O4	98
5.	CuO	52
6.	Fe3O4	40
7.	Cu(NO3)2	12
8.	Fe(NO3)3	4
9.	Without catalyst	traces
10.	GO + CuFe2O4 physical mixing	74
11.	CuFe2O4 powder	52

^aReaction conditions: 2-naphthol (2 mmol) and benzaldehyde (1 mmol). ^bIsolated yield.