Benzoic Acid (molecular formula: C₇H₆O₂) is the simplest aromatic carboxylic acid, consisting of a benzene ring directly connected to a carboxyl group (-COOH). It appears as white needle-like or scaly crystals with a faint, pleasant odor (similar to benzoin or balsam), which is why it is also known as "flowers of benzoin."

Core Chemical Properties

The unique molecular structure of benzoic acid provides two distinct reactive sites:

• Carboxyl group reaction site: Can participate in esterification, amidation, salt formation, and other reactions.

• Benzene ring reaction site: The carboxyl group is a meta-directing group, directing electrophilic substitution reactions (such as nitration and halogenation) to the meta position.

Application Introduction

1 Pharmaceutical Applications

Benzoic acid and its derivatives are widely used in the synthesis of local anesthetics (e.g., benzocaine), antipyretic/analgesic precursors (e.g., aspirin precursors), and ointments for treating superficial fungal infections (e.g., benzoic acid and salicylic acid ointment).

2 Food and Cosmetic Applications

• Food Preservation: At 0.1% concentration in acidic environments (pH 2.5–4.5), it effectively inhibits bacterial growth. Used in soy sauce, fruit juices, beverages, etc.

• Cosmetic Products: Used as a preservative and pH adjuster in creams, shampoos, wet wipes, etc. Global production of cosmetic-grade benzoic acid reached 22,000 tons in 2025.

• Fragrance Fixative: Benzoate esters possess fruity aromas and are used in essences and perfumes.

3 Industrial and Organic Synthesis Applications

• Plasticizers: Used to improve the flexibility of PVC plastics.

• Coating Additives: Accelerate film drying, improve gloss and hardness.

• Rust Inhibitor: Used for corrosion protection in automotive cooling systems.

• Dye Synthesis: Serves as an intermediate for azo dyes and other colorants.

4 Cutting-Edge Research Applications

• Medicinal Chemistry: The carboxyl group is converted into strong directing groups for ortho-C-H bond functionalization reactions.

• Metabolomics: Deuterated benzoic acid is used as an internal standard for NMR and mass spectrometry analysis.

• Advanced Materials: Used in the synthesis of liquid crystal materials, polymer additives, etc. In 2025, Professor Jiao Ning's team at Peking University reported a decarboxylative aromatic ring-opening reaction of benzoic acid.

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At J&K Scientific, we offer a diverse selection of benzoic acid compounds with high purity and reliable quality, suitable for both laboratory research and industrial applications.

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