反应详情

温度

0 °C

A 250-mL single-neck round bottomed flask equipped with a magnetic stirrer was charged with methyl 4-chlorosalicylate (25.0 g, 134 mmol) followed by concentrated sulfuric acid (73 mL) and the resulting suspension cooled to 0° C. using an ice bath. Concentrated nitric acid (6.20 mL, 147 mmol) was then added and the reaction stirred for 1 h at 0° C. After this time, the reaction was poured into ice and the resulting precipitate collected by vacuum filtration. The filter cake was washed with water (20 mL) and then re-crystallized from hot ethanol (100 mL) to afford methyl 4-chloro-3-nitrosalicylate in 52% yield (16.0 g) as white solid: 1H NMR (300 MHz, CDCl3) δ 8.15 (d, J=2.7 Hz, 1H), 8.11 (d, J=2.7 Hz, 1H), 4.03 (s, 3H); MS (ESI) m/z 232 [M+H]+.

1. customA 250-mL single-neck round bottomed flask equipped with a magnetic stirrer
2. additionAfter this time, the reaction was poured into ice
3. filtrationthe resulting precipitate collected by vacuum filtration
4. washThe filter cake was washed with water (20 mL)
5. customre-crystallized from hot ethanol (100 mL)