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The half-neutralization potentials (HNP) and the corresponding pKa values of compounds 3a-3e in tert-butyl alcohol at 25 °C.
| Compd. no | HNP1 (mV) | pKa1 | HNP2 (mV) | pKa2 |
|---|---|---|---|---|
| 3a | -384 | 13.65 | -501 | - |
| 3b | -443 | 15.62 | -558 | - |
| 3c | -416 | 14.00 | -544 | - |
| 3d | -472 | - | - | - |
| 3e | -448 | 14.96 | - | - |
