pKa values of 1H, 2H and 3H2 in DMSO determined by 1H NMR spectroscopy at 25 °C using different deprotonating agentsa.
| Base | 1H | 2H | 3H2 | |
|---|---|---|---|---|
| pKa,1 | pKa,1 | pKa,1 | pKa,2 | |
| DIPEA | 9.69(1) | 9.41(1) | 9.2(1) | 10.65(6) |
| OAc− | 9.74(4) | 9.6(1) | — | 10.4(1) |
| H2PO4− | 9.72(1) | 9.58(3) | 9.5(1) | 10.39(2) |
Uncertainties are given in parentheses as standard deviation.