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1H-NMR signal assignments for the ephedrine alkaloid derivatives (δ in ppm).
| Compound | Aromatic Protons | H-1 | H-2 | CH3-3 | NCH3 |
|---|---|---|---|---|---|
| methylephedrine (ME) | 7.14–7.31 | 4.96 | 2.45 | 0.74 | 2.28 |
| ephedrine (EP) | 7.32 | 4.76 | 2.65 | 0.84 | 2.45 |
| norephedrine (NE) | 7.31 | 4.52 | 3.18 | 0.96 | - |
| norpseudoephedrine (NP) | 7.21–7.38 | 4.24 | 3.03 | 1.04 | - |
| pseudoephedrine (PE) | 7.33 | 4.17 | 2.63 | 0.95 | 2.45 |
| methylpseudoephedrine (MP) | 7.20–7.43 | 4.19 | 2.59 | 0.72 | 2.31 |
