Ketones, Properties Of The Carbonyl GroupOther molecules with carbonyl groups
A carbonyl group is a group of atoms that consists of a carbon atom covalently attached to an oxygen atom by a double bond: C = O. The carbon atom, to satisfy its valence of 4, must also be attached by covalent bonds to two other atoms. The simplest type of molecule that contains a carbonyl group is a ketone. Other types of molecules that contain carbonyl groups are aldehydes, acids, esters, and amides.
In many molecules that contain a carbonyl group, the other two groups of atoms are not hydrocarbon groups. Molecules like this are so different chemically that they belong to entirely different classifications. There are four major classes of molecules like this. Again, R stands for any hydrocarbon group. There is more information about these kinds of carbonyl-containing molecules in their entries in this encyclopedia.
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G. Lynn Carlson