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The half-neutralization potentials (HNP) and the corresponding pKa values of compounds 3a-3e in acetonitrile at 25 °C.
| Compd. no | HNP1 (mV) | pKa1 | HNP2 (mV) | pKa2 |
|---|---|---|---|---|
| 3a | -441 | 15.41 | -536 | - |
| 3b | -493 | 15.63 | - | - |
| 3c | -482 | - | -578 | - |
| 3d | -474 | 15.28 | - | - |
| 3e | -507 | - | - | - |
