Table 3.

Reusability test of the Cu(II)-CA catalyst in the CuAAC reaction ^a.

Run	Cu(II)-CA b
1	91
2	85
3	78
4	62

^a Reaction conditions: azide (0.6 mmol), alkyne (0.5 mmol), H₂O (3 mL), catalyst (5 mol% Cu), room temperature. ^b Isolated yield after 8 h.