TABLE 4.

Various solvent effects for the isolation of better yields.

Entry	GO-Cu(II)-bis-cyclen catalyst (mol%) a	Solvent	Yield (%) b
1	—	t-butanol/H2O (2:4 v/v)	0
2	10 c	t-butanol/H2O (2:4 v/v)	0
3	10	t-butanol/H2O (2:3 v/v)	43
4	10	t-butanol/H2O (2:4 v/v)	50
5	15	t-butanol/H2O (2:4 v/v)	76
6	20	t-butanol/H2O (2:4 v/v)	81
7	30	t-butanol/H2O (2:4 v/v)	89
8	30	t-butanol	67
9	30	Ethanol	77
10	30	CH3CN	64
11	30	H2O	78
12	30	DMSO	51

^aReaction conditions: phenyl acetylene (1 mmol), benzyl azide (1 mmol), and sodium ascorbate (5 mg) were reacted at RT.

^bIsolated yield of 1-benzyl-4-phenyl-1H-1,2,3-triazole.

^cWithout the catalyst, sodium ascorbate.