| Compound No. | R | X |
| 5a | H | H |
| 5b | H | Br |
| 5c | H | Cl |
| 5d | H | F |
| 5e | OCH3 | H |
| 5f | OCH3 | Br |
| 5g | OCH3 | Cl |
| 5h | OCH3 | F |
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