Table 1. Catalytic activity results in different reaction conditions.

No.	Reaction conditions	Catalyst	Reaction time (h)	Yield (%)
1	Water – HCl	Cu(II) acetate	1.5	52
2	Water – NaHSO4	Cu(II) acetate	2	60
3	Water – NaHSO4	Cu(II) glyoxime	2	No conversion
4	Water – NaHSO4	Pd(II) glyoxime	2	No conversion
5	Water – NaHSO4	Fe(II) glyoxime	2	No conversion
6	Water – NaHSO4	Ni(II) glyoxime	2	No conversion
7	Water – NaHSO4	Cu(II) carboxylate	2	95