Ammonium salts of fluorophthalamic acids and method of preparation

摘要

Ammonium salts of fluorophthalamic acids characterized by the formula <IMAGE> wherein n is 1 or 2, are prepared by the steps of (A) reacting a chlorophthalic anhydride of the formula <IMAGE> where n is as defined previously, with potassium fluoride or cesium fluoride to form a fluorophthalic anhydride of the formula <IMAGE> where n is as previously defined, and (B) reacting the fluorophthalic anhydride with ammonium to form an ammonium salt of a fluorophthalamic acid.