Benzoic acid exists widely in nature as a free acid, an ester or a derivative thereof. Benzoic acid is 1 important chemical raw materials and chemical reaction intermediates, mainly used in the preparation of sodium benzoate preservatives, and used in the synthesis of drugs, dyes, but also used in the production of plasticizers, mordants, fungicides and spices. The chemical structure of benzoic acid has a carboxyl group and a benzene ring, which can occur neutralization, salt formation, ester formation and other reactions, and meta-substitution reactions can also occur on the benzene ring, which enables benzoic acid to derive many derivatives.
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