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Reference.org
Acyl chloride
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, an acyl chloride (or acid chloride) is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the <a href="/facts/Functional_group/GXkSPsjM">functional group</a> −C(=O)Cl. Their formula is usually written R−COCl, where R is a <a href="/facts/Side_chain/Lw8KPAXn">side chain</a>. They are reactive derivatives of <a href="/facts/Carboxylic_acid/U4xuMosy">carboxylic acids</a> (R−C(=O)OH). A specific example of an acyl chloride is <a href="/facts/Acetyl_chloride/SU9Bq4tG">acetyl chloride</a>, CH3COCl. Acyl chlorides are the most important subset of <a href="/facts/Acyl_halide/2EdXuvun">acyl halides</a>. </p>