TABLE 3.

A comparison of Cu(II)/polyimide‐linked covalent‐organic framework (PL‐COF) and other catalysts for 2,4,5‐triarylimidazole 4a synthesis

Entry	Catalyst	Time (min)	Yield (%)a	Ref.
1	(NH4)6Mo7O24⋅4H2O	10	94	47 ]
2	MoO3/SiO2	132	95	48
3	Lactic acid	180	92	49
4	Tetrabutylammonium bromide	20	95	46
5	TiCl4‐SiO2	60	93	50
6	CoFe2O4	20	95	29
7	Cu(II)/PL‐COF	2	96	This study