| Bromopyridine | Hydroxypyridine | Fluoropyridine |
| Methylpyridine | Aminopyridine | Dihydropyridine |
| Iodopyridine | Benzylpyridinium | |
| Chloropyridine | Ethylpyridine | |
| Nitropyridine | Cyanopyridine |

| Bromopyridine | Hydroxypyridine | Fluoropyridine |
| Methylpyridine | Aminopyridine | Dihydropyridine |
| Iodopyridine | Benzylpyridinium | |
| Chloropyridine | Ethylpyridine | |
| Nitropyridine | Cyanopyridine |
