Table 2.

Investigation of the catalytic effects of Fe₃O₄@SiO₂-PMA-Cu components on the model reaction.

Entry	Catalyst	Time (h)	Yield (%)b
1	Fe3O4@SiO2-PMA-Cu	1.5	98
2	Fe3O4@SiO2	6	46
3	Fe3O4@SiO2-PMA	6	50
4	Fe3O4	6	Trace
5	SiO2	6	45
6	PMA	6	40
7	Cu	2	91

All reactions were carried out in the presence of 0.1 g catalyst at 55 °C.

^aIsolated yields.

Significant values are in bold.