Synthesis of various aryl imidazole derivatives using CTSN/Fe₃O₄–Cu nanocatalyst.

Entry	R–Ar–X		Product structure	Product no.	Yielda (%)
	R	X
1	H	Br		3a	98
2	Me	Br		3b	92
3	Me	I		3c	90
4	OMe	I		3d	85
5	OH	Br		3e	82
6	Cl	I		3f	93
7	COMe	Br		3g	92
8	CN	I		3h	98
9	NO2	Br		3i	96
10	NO2	I		3j	97

^aIsolated yield.