Abstract
Nitration of salicylic acid using 2-propyl nitrate / sulfuric acid / tetrabutylammonium hydrogensulfate / dichloromethane / water yielded a mixture of 3-nitro and 5-nitrosalicylic acids in the ratio 56:44. Pure potassium 3-nitrosalicylate was crystallized and converted to 3-nitrosalicylic acid in 30% overall yield.