1H NMR chemical shifts1-a of (−)-epicatechin metabolites
| (−)-Epicatechin | 3′-O-methyl-(−)-epicatechin | 4′-O-methyl-(−)-epicatechin | |
|---|---|---|---|
| H-2 | 4.86 s | 4.93 s | 4.92 s |
| H-3 | 4.20 m | 4.23 m | 4.23 m |
| H-4α | 2.73 dd (4.1, 17.1) | 2.78 dd (2.9, 16.5) | 2.75 dd (3.2, 16.6) |
| H-4β | 2.85 dd (4.0, 17.1) | 2.87 dd (4.6, 16.5) | 2.88 dd (4.6, 16.6) |
| H-6 | 6.02 d (2.3) | 6.03 d (2.4) | 6.03 d (2.4) |
| H-8 | 5.92 d (2.3) | 5.93 d (2.4) | 5.93 d (2.4) |
| H-2′ | 7.04 d (1.8) | 7.19 d (1.9) | 7.07 d (1.8) |
| H-5′ | 6.79 d (8.3) | 6.81 d (7.9) | 6.91 d (8.4) |
| H-6′ | 6.83 dd (1.8, 8.3) | 6.97 dd (1.9, 7.9) | 6.95 dd (1.9, 8.4) |
| OCH3 | 3.84 s | 3.84 s |
↵1-a Chemical shifts are expressed in ppm down field from the signal for TMS in acetone-d6, and coupling constants in Hz are in parentheses.