Table 1.

Synthesis of 1,2,3-Triazole from Benzylazide and Phenylacetylene (Dioxane/H₂O 8:2, 70°C)

no.	catalyst	method	time (h)	yield (%)
1		oil bath	24	1a–4b
2		US	5	2a–2b
3	CuSO4/ascorbic acid	oil bath	0.5	78
4	Cu2O	oil bath	24	90
5	Cu2O	US	5	71
6	Cu wires	oil bath	24	52
7	Cu wires	USc	2	64
8	Cu wires	US	2	85
9	Cu turnings	oil bath	12	76
10	Cu turnings	MW	2	39
11	Cu turnings	US	1.5	89
12	Cu turnings	USd	2	25
13	Cu turnings	MW/US	1	95
14	Cu turnings	MW/USe	1	85

^aIsomer 1,4.

^bIsomer 1,5.

^cUS 80W, without oil bath.

^dDepassivated metal.

^eReaction carried out under nitrogen.