| Comp. | R | RMN1H signals for aromatic region (δ : ppm) | | Yield [%] | ESI (m/z) | IR (KBr, ν cm−1) | SO2 | C=O |
| 4a | Propyl | 7.15 (s, 2H) | | 76 | 509 | 1148, 1339 | / | 4b | Butyl | 7.16 (s, 2H) | | 79 | 567 | 1149, 1354 | / | 4c | Benzyl | 6.79 (s, 2H) | | 75 | 710 | 1157, 1357 | / | 4d | Benzyl | 7.13 (s, 2H) | | 55 | 721 | 1150, 1392 | 1715 | 4e | CH2COOEt | 7.21 (s, 2H) | | 48 | 713 | 1139, 1380 | 1723, 1751 | | CH(CH3)COOMe | 7.13 (s, 2H) | | 37 | 713 | 1144, 1368 | 1732, 1745 | | Benzyl | 6.75 (s, 1H) | 7.27(s, 1H) | 15 | 721 | 1155, 1371 | 1715 | | CH2COOEt | 7.05 (s, 1H) | 7.32 (s, 1H) | 24 | 713 | 1139, 1380 | 1723, 1755 | | CH(CH3)COOMe | 7.00 (s, 1H) | 7.24(s, 1H) | 34 | 713 | 1144, 1390 | 1732, 1750 |
|
|