Table 2.

Synthesis of the mono-polyhydroquinoline derivatives in the presence of MgZnFe₂O₄@ZSC-Cu nanoparticles.

Entry	Aldehyde	Cyclic diketone	Product	Time (min)	Yielda (%)	M.P. (°C)		Ref.
						Found	Reported
1	C6H5CHO	Dimedone	5a	4	96	204–202	203–207	[47]
2	4-FC6H4CHO	Dimedone	5b	10	93	198–200	180–182	[37]
3	3,4-(OCH3)2 C6H3CHO	Dimedone	5c	15	97	184–186	184–186	[48]
4	2,6-(Cl)2C6H3CHO	Dimedone	5d	10	98	242–244	241–244	[37]
5	4-NO2C6H4CHO	Cyclohexane-1,3-dione	5e	5	98	205–206	201–202	[37]
6	3-OHC6H4CHO	Cyclohexane-1,3-dione	5f	20	93	215–216	–	new
7	5-Br-2-OHC6H3CHO	Cyclohexane-1,3-dione	5g	25	95	217–220	_	new

^aObtaned yeild. Condition: aldehyde (1 mmol), dimedone (1 mmol, 0.14 g), ethyl acetoacetate (1 mmol, 0.13 mL), ammonium acetate (1.5 mmol, 0.12 g), MgZnFe₂O₄@ZSC-Cu (8 mg) under solvent free condition.