One-pot synthesis of β-hydroxy-1,2,3-triazoles from epoxides catalyzed by nano-CoFe₂O₄/Cu(OH)₂^a.

Entry	Epoxide (a)	Alkyne	Triazole (b)	Time (h)	Yieldb (%)
1				3.3	94
2				3	95
3				3.3	90
4				4.3	88
5				4.5	85
6				4.5	87
7				5.5	75
8				4.3	80
9				4.2	85
10				6.3	84
11				5	82
12				6	85
13				6	87
14				6.5	88
15				5	80
16				5	90
17				6	92
18				5.5	85
19				4	90
20				5	88
21				6.5	84

^aAll reactions were carried out with 1 mmol of epoxide in the presence of alkyne (1 mmol), sodium azide (1.2 mmol) and nano-CoFe₂O₄/Cu(OH)₂ (0.032 g, 0.1 mmol, 10 mol%) in water at 60 °C.

^bYields refer to isolated pure products.