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| Entry | Catalyst | Solventa | Temperature | Time (min) | Yieldb (%) |
|---|---|---|---|---|---|
| 1 | CuB 4 O 7 | Neat | 80 °C | 10 | 98 |
| 2 | Cu(OAc)2·H2O | Neat | 80 °C | 120 | 72 |
The reaction was performed with, benzil 1 (1 mmol), 2-nitrobenzaldehyde 2 (1 mmol), and NH4OAc (3) in the presence of CuB4O7 and Cu(OAc)2. H2O under solvent-free condition.
Isolated yield.
