Crude | Recryst. | Crystal | ||||
---|---|---|---|---|---|---|
No. | X | yield | mp(℃) | Appearance | IR (cm-1) | |
(%) | Solv. | |||||
(tri-sub) | ||||||
4a | p-CN | 99.6% | 83-89 | (a) | Dull orange | 2225(CN) |
Powder | 842&784(para) | |||||
Hexanes & | Fibrous | 1707(C=O) | ||||
Pale yellow | 1274(C-O) | |||||
4b | p-CO2CH3 | 95.7% | 118-119 | cyclohexane | Needles | 827&799(para) |
4c | p-Br | 70.6% | 91-92 | Isopropanol | Pale yellow | 832&801(para) |
Needles | ||||||
Pink | ||||||
4d | p-CH3 | 70.2% | 93-94 | Isopropanol | Plates | 827&790(para) |
lustrous | 1509 & | |||||
4e | p-NO2 | 90.5% | 124-125 | Ethanol | Red-brown | 1379(NO2) |
needles | 848&795(para) | |||||
Off-white | 695 & 765 | |||||
4f | H | 93.2% | 94.5-95.5 | Isopropanol | Needles | (monosub) |
798(para) |