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Reference.org
Carbonyl group
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, a carbonyl group is a <a href="/facts/Functional_group/GXkSPsjM">functional group</a> with the formula C=O, composed of a <a href="/facts/Carbon/ukrgQexo">carbon</a> <a href="/facts/Atom/FoQ4kGN5">atom</a> <a href="/facts/Double_bond/qDemMn0c">double-bonded</a> to an <a href="/facts/Oxygen/acyn6o8r">oxygen</a> atom, and it is <a href="/facts/Divalent/ck7cHByj">divalent</a> at the C atom. It is common to several classes of organic compounds (such as <a href="/facts/Aldehydes/xSIRkW03">aldehydes</a>, <a href="/facts/Ketones/BqQXpLo4">ketones</a> and <a href="/facts/Carboxylic_acid/U4xuMosy">carboxylic acid</a>), as part of many larger functional groups. A compound containing a carbonyl group is often referred to as a carbonyl compound. </p><p>The term carbonyl can also refer to <a href="/facts/Carbon_monoxide/CKuLtEMJ">carbon monoxide</a> as a <a href="/facts/Ligand/6etB3qeW">ligand</a> in an <a href="/facts/Inorganic/TfFfzxSz">inorganic</a> or <a href="/facts/Organometallic/bhqFz2P0">organometallic</a> complex (a <a href="/facts/Metal_carbonyl/KzJBcMzU">metal carbonyl</a>, e.g. <a href="/facts/Nickel_carbonyl/8Py5Dre1">nickel carbonyl</a>). </p><p>The remainder of this article concerns itself with the organic chemistry definition of carbonyl, such that carbon and oxygen share a double bond. </p>