Table 2.
1H-NMR of azomethines 5-16 (DMSO-d6) (δ, ppm).
| Compd. | 1H-NMR |
|---|---|
| 5 | 9.45 (s, 1H, -OH, exchangeable), 8.36 (s, 1H, benzylidenimine H), 8.08-6.90 (m, 7H, Ar-H), 3.80 (s, 3H, -OCH3). |
| 6 | 9.75 (s, 1H, -OH, exchangeable), 8.43 (s, 1H, -CH=N), 7.52-6.88 (m, 8H, Ar-H), 3.84 (s, 3H, -OCH3). |
| 7 | 8.10 (m, 1H, -CH=N), 7.60-6.95 (m, 11H, Ar-H and olefinic H). |
| 8 | 8.25 (d, 1H, benzylideimin H, J = 5.36 Hz), 7.54-7.07 (m, 12H, Ar-H and olefinic H). |
| 9 | 12.27 (s, 1H, OH, exchangeable), 8.99 (s, 1H, -CH=N), 8.32-6.98 (m, 7H, Ar-H). |
| 10 | 8.73 (s, 1H, benzylidenimine H), 8.09-7.23 (m, 11H, Ar-H). |
| 11 | 9.76 (s, 1H, OH, exchangeable), 8.53 (s, 1H, benzylidenimine H), 8.29-6.92 (m, 10H, Ar-H), 3.89 (s, 3H, -OCH3). |
| 12 | 8.64 (s, 1H, -CH=N), 7.93-6.97 (m, 8H, Ar-H), 3.77 (s, 3H, -OCH3). |
| 13 | 9.60 (s, 1H, OH, exchangeable), 8.44 (s, 1H, -CH=N), 7.49-6.86 (m, 7H, Ar-H), 3.83 and 3.76 (2s, 6H, 2 -OCH3). |
| 14 | 13.38 (s, 1H, OH, exchangeable), 8.59 (s, 1H, benzylidenimine H), 7.36-6.89 (m, 7H, Ar-H), 3.82 (s, 3H, -OCH3) |
| 15 | 8.41 (s, 1H, -CH=N),7.83-7.11 (m, 8H, Ar-H), 2.36 (s, 3H, -CH3) |
| 16 | 13.19 (s, 1H, OH, exchangeable), 8.94 (s, 1H, -CH=N), 7.63-6.93 (m, 7H, Ar-H), 2.33 (s, 3H, -CH3). |