Table 5. Isolated Yield of Condensation Product Using MgO Calcined at Different Temperatures^a.

entry	MgO particles	isolated yield (%)
1	MgOS_400	87
2	MgOS_600	76
3	MgOS_800	67
4	MgOA_800	10

^aReaction conditions: benzaldehyde, 4 mmol; malononitrile, 6 mmol; MgO, 20 mg; oil phase, 3 mL; water, 3 mL; room temperature, 30 min.