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Amide-rotation equilibrium in the model compounds.a
 | |||
| compound | Ktrans/cis | ||
| in D2O, ε 80.1 | in CD2Cl2, ε 8.9 | in C6D6, ε 2.3 | |
 |
4.95 ± 0.05 | 4.18 ± 0.04 | 5.22 ± 0.15 |
 1 |
2.57 ± 0.08 | 1.71 ± 0.07 | 2.09 ± 0.03 |
 2 |
7.08 ± 0.27 | 4.64 ± 0.10 | 5.38 ± 0.22 |
 3 |
4.36 ± 0.11 | 3.22 ± 0.06 | 5.39 ± 0.09 |
 4 |
3.57 ± 0.13 | 2.66 ± 0.11 | 4.69 ± 0.14 |
aMeasured by 1H and 19F NMR at 298 K. The values are provided with the standard deviation.
