a Department of Organic Chemistry, Faculty of Pharmacy, Wroc?aw Medical Academy ul. Grodzka 9, 50-137 Wroc?aw, Poland b Faculty of Chemistry, Wroc?aw University, 14 F. Joliot-Curie Street, 50-383 Wroc?aw, Poland
Abstract:
Reactions of 4-nitro-3(5)-pyrazolecarboxylic acid dipotassium salt with different methylating agents in various solvents have been investigated to improve the synthesis of isomeric 1-methyl-4-nitro-3- and -5-pyrazolecarboxylic acids.