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C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
C07C51/316—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting with oxides of nitrogen or nitrogen-containing mineral acids