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Acyl group
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, an acyl group is a <a href="/facts/Moiety_(chemistry)/WxKqcJe1">moiety</a> derived by the removal of one or more <a href="/facts/Hydroxyl/1Hs2QAEv">hydroxyl</a> groups from an <a href="/facts/Oxoacid/p0bMdwSx">oxoacid</a>, including <a href="/facts/Inorganic_acid/MaftYXr0">inorganic acids</a>. It contains a double-bonded <a href="/facts/Oxygen/acyn6o8r">oxygen</a> <a href="/facts/Atom/FoQ4kGN5">atom</a> and an <a href="/facts/Organyl_group/RgeaN5jm">organyl group</a> (R−C=O) or <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> in the case of <a href="/facts/Formyl_group/xSIRkW03">formyl group</a> (H−C=O). In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, the acyl group (<a href="/facts/IUPAC/2AV6myCK">IUPAC</a> name alkanoyl if the organyl group is <a href="/facts/Alkyl/vmEk8X4v">alkyl</a>) is usually derived from a <a href="/facts/Carboxylic_acid/U4xuMosy">carboxylic acid</a>, in which case it has the formula R−C(=O)−, where R represents an <a href="/facts/Organyl/gqCNaN45">organyl</a> group or <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a>. Although the term is almost always applied to organic compounds, acyl groups can in principle be derived from other types of acids such as <a href="/facts/Sulfonic_acid/6JHPGnNY">sulfonic acids</a> and <a href="/facts/Phosphonic_acid/4A4bHBTw">phosphonic acids</a>. In the most common arrangement, acyl groups are attached to a larger molecular fragment, in which case the carbon and oxygen atoms are linked by a <a href="/facts/Double_bond/qDemMn0c">double bond</a>. </p>