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The effects of different solvents on the reaction of benzene-1,2-diamine with benzil in the presence of bentonite clay K-10 at room temperature.
| Entry | Solvent | Time, Min | Isolated Yields% |
|---|---|---|---|
| 1 | EtOH | 20 | 95 |
| 2 | MeOH | 30 | 91 |
| 3 | H2O | 120 | trace |
| 4 | CHCl3 | 30 | 87 |
| 5 | CH2Cl2 | 30 | 82 |
| 6 | MeCN | 35 | 92 |
| 7 | THF | 30 | 89 |
