The carboxylic acid-derived ester linkages in a triglyceride or typical glycerophospholipid have the form . Here the acyl group is attached through oxygen to the glycerol-derived part. See IUPAC Blue Book, P-65.6: esters.
, an alpha-methyl-substituted acrylate. Conjugate addition installs a chain whose carbon next to the ester retains the methyl substituent.
A compound with a ketone carbonyl at the beta position relative to an ester carbonyl.
An ester containing the conjugated fragment Ph-CH=CH-C(=O)-O-R. Its trans alkene commonly has a large vicinal proton coupling, while HMBC can connect an alkoxy methylene to the ester carbonyl.
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, an activated alkene useful as a dienophile and Michael acceptor.
A covalent organic nitrate group, distinct from a nitro group and from the nitrate anion.
A cyclic ester. Intramolecular alcohol-to-carbonyl attack followed by elimination can close a lactone ring.
A benzene-fused five-membered lactone containing a gem-dimethyl-substituted saturated ring carbon. It can result from double methyl addition to one carbonyl of dimethyl phthalate followed by ring closure.
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The dimethyl ester of benzene-1,2-dicarboxylic acid, with adjacent ester groups on a benzene ring.
An ester of a sulfonic acid. In an appropriate alkyl sulfonate, substitution at carbon can expel a resonance-stabilized sulfonate leaving group.
A cyclic sulfonate ester. Alkoxide attack at a suitable primary carbon bound to the ring oxygen can open the ring by carbon–oxygen cleavage, leaving a sulfonate group.
The ester CH3COOCH2CH=CH2. Its terminal vinyl hydrogens are chemically nonequivalent and have distinct cis and trans couplings to the internal vinyl proton.
The methyl ester of but-2-enoic acid. Its conjugated acyl group has different carbonyl and vinylic environments from an ester whose alkene lies in an allyl alcohol-derived group.
An ester with a methylene group between two carbonyls. Its conjugate base is stabilized by delocalization involving both carbonyl groups.
An ester consumed in the conductometric saponification assay, where hydrolysis under basic conditions produces ethanol and an acetate ion.

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