反应详情

To a solution of 100 g of methyl 5-chlorosalicylate and 250 ml of concentrated sulfuric acid (while keeping at a temperature below 0° C.) is added dropwise a mixture of 25 ml of funing nitric acid (d 1.50) and 25 ml of concentrated sulfuric acid at a temperature below 5° C. The resultant solution is stirred under ice cooling for 0.5 hour and poured into ice-cold water. The precipitated crystals are collected by filtration and dried to give 122 g of methyl 5-chloro-3-nitrosalicylate, melting at 108°-110° C.

1. customwhile keeping at a temperature below 0° C.
2. additionis added dropwise
3. additionpoured into ice-cold water
4. filtrationThe precipitated crystals are collected by filtration
5. customdried