4-Methylphenylacetic acid is an important aromatic carboxylic acid intermediate widely used in fine chemical and pharmaceutical synthesis. It serves as core raw material to prepare anti-inflammatory, analgesic and antibacterial drugs through esterification, amidation and condensation reactions. It is also adopted to synthesize pesticide fungicides, plant growth regulators and veterinary medicines. In spice industry, it is used to produce aromatic ester flavors with lasting fragrance. Besides, it acts as modifier for polymer materials and organic synthesis reagent for ring closure and substitution reactions. Its stable molecular structure and active carboxyl group make it indispensable in drug development, daily chemical fragrance and agrochemical manufacturing fields.

This chemical has mild irritation and low toxicity. Inhalation of fine powder will stimulate respiratory tract and cause throat discomfort and cough, so keep working area ventilated and wear dust-proof mask. Skin contact may lead to dryness, redness and itching, long-term contact damages skin surface, wear protective gloves and clean skin timely after exposure. Eye contact triggers stinging pain and conjunctival inflammation, flush eyes with abundant running water for over fifteen minutes once contaminated. Accidental ingestion causes nausea and abdominal upset, large intake affects digestive function. High temperature decomposition generates harmful smoke. Store separately from oxidants, alkaline substances and food. Waste residues shall be disposed in accordance with organic chemical waste norms to prevent personal injury and environmental pollution.