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<h3>Overview</h3>
<p><strong>4-Hydroxybenzoic acid</strong> (CAS 99-06-7, C<sub>7</sub>H<sub>6</sub>O<sub>3</sub>) is a key aromatic intermediate synthesized via Kolbe-Schmitt reaction. It serves as a primary precursor for parabens and liquid crystals.</p>
<h3>Application</h3>
<ul>
<li>Polymer industry: Synthesis of high-performance thermoplastics.</li>
<li>Pharmaceuticals: Manufacturing preservatives and active ingredients.</li>
<li>Agrochemicals: Production of herbicides and fungicides.</li>
</ul>
<h3>Precautions</h3>
<p>Store in cool, dry conditions away from oxidizers. Use PPE to prevent skin irritation; inhalation of dust must be avoided during handling.</p>