| R/Ar | Compound | R’ | Compound | R’ | Compound | R’ |
|---|---|---|---|---|---|---|
 |
6a | H | 6b | CH3 | 6c | OCH3 |
| 6d | Cl | 6e | NO2 | 6f | F | |
 |
6g | H | 6h | CH3 | 6i | OCH3 |
| 6j | Cl | 6k | NO2 | 6l | F | |
 |
6m | H | 6n | CH3 | 6o | OCH3 |
| 6p | Cl | 6r | NO2 | 6s | F |
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