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. 1998 Apr 14;95(8):4158–4163. doi: 10.1073/pnas.95.8.4158

Table 1.

The calculated deprotonation energies for compounds 1–4 at the HF/6-31G(d), HF/6-31+G(d), and MP2/6-31+G(d) levels of theory

Compound Deprotonation energy, kcal/mol
HF/6-31G(d) HF/6-31+G(d) MP2/6-31+G(d)
1 389.8 380.1 363.9
2 380.5 371.8 354.0
3 374.0 365.4 349.0
4 369.2 361.6 347.4