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The half-neutralization potentials (HNP) and the corresponding pKa values of compounds 3a-3e in isopropyl alcohol at 25 °C.
| Compd. no | HNP1 (mV) | pKa1 | HNP2 (mV) | pKa2 |
|---|---|---|---|---|
| 3a | -363 | 13.22 | -495 | - |
| 3b | -367 | 13.92 | - | - |
| 3c | -369 | 13.78 | -474 | - |
| 3d | -355 | 13.63 | -460 | 16.00 |
| 3e | -344 | 12.85 | -449 | 14.98 |
