Trimethyloxonium tetrafluoroboronic acid is white or off-white solid at room temperature and pressure, which is sensitive to water and has certain hygroscopicity
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<h3>Overview</h3>
<p><strong>Trimethyloxonium tetrafluoroborate</strong> (CAS 1498-65-7) is a potent methylating agent with the formula <strong>(CH₃)₃OBF₄</strong>. It is synthesized via the reaction of dimethyl ether with trimethylaluminum or similar precursors, serving as a critical reagent for introducing methyl groups into nucleophilic substrates under mild conditions.</p>
<h3>Application</h3>
<ul>
<li>Pharmaceutical synthesis: Methylation of phenols and carboxylic acids to form ethers and esters.</li>
<li>Organic chemistry: Preparation of quaternary ammonium salts and O-methylated derivatives.</li>
<li>Natural product modification: Selective methylation in complex molecule construction.</li>
</ul>
<h3>Precautions</h3>
<p>Store in a dry, inert atmosphere below -20°C due to moisture sensitivity. Use appropriate PPE; avoid contact as it causes severe skin burns and eye damage. Do not use in clinical settings without rigorous purification protocols.</p>