4-nitro-oxi-methyl-benzoic acid preparation procedure.

Acid Preparation Procedure 4-nitro-oxy-methyl-benzoic. The present invention relates to a new acid preparation procedure 4-nitro-oxy-methyl-benzoic, which comprises the following stages: a) acid reaction 4-chloromethyl-benzoic with nitrate silver and in the presence of an acid as catalyst in acetonitrile a reflux temperature, followed by cooling and adding a aprotic polar solvent; b) separation of silver salts by filtration, followed by washing with an aprotic polar solvent; c) acid precipitation 4-nitro-oxy-methyl-benzoic with water from the filtrate of step b); Y d) acid drying 4-nitro-oxy-methyl-benzoic.