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<p>as an air pollutant.</p>

<p><big>In organic chemistry</big></p>
<p>Demethylation often refers to cleavage of <a href="page.php?w=ethers">ethers</a>, especially aryl ethers.</p>

<p>Historically, aryl methyl ethers, including natural products such as <a href="page.php?w=codeine">codeine</a> (O-methylmorphine), have been demethylated by heating the substance in molten pyridine <a href="page.php?w=hydrochloride">hydrochloride</a> (melting point ) at , sometimes with excess <a href="page.php?w=hydrogen_chloride">hydrogen chloride</a>, in a process known</p><p>
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