Pyrones or pyranones are a class of
heterocyclic chemical compounds. They contain an
unsaturated six-membered ring containing one oxygen atom and a
ketone
In organic chemistry, a ketone is a functional group with the structure R–C(=O)–R', where R and R' can be a variety of carbon-containing substituents. Ketones contain a carbonyl group –C(=O)– (which contains a carbon-oxygen double bo ...
functional group
In organic chemistry, a functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo the same or similar chemical reactions regardless of the rest ...
.
There are two isomers denoted as
2-pyrone and
4-pyrone
4-Pyrone (γ-pyrone or pyran-4-one) is an unsaturated cyclic chemical compound with the molecular formula C5H4O2. It is isomeric with 2-pyrone.
Preparation
4-Pyrone is prepared via the thermal decarboxylation of chelidonic acid.
Reactions
4- ...
. The 2-pyrone (or α-pyrone) structure is found in nature as part of the
coumarin ring system. 4-Pyrone (or γ-pyrone) is found in some natural chemical compounds such as
chromone
Chromone (or 1,4-benzopyrone) is a derivative of benzopyran with a substituted keto group on the pyran ring. It is an isomer of coumarin.
Derivatives of chromone are collectively known as ''chromones''. Most, though not all, chromones are also ...
,
maltol and
kojic acid.
See also
*
Furanone
2-Furanone is a heterocyclic organic compound. It is also known as γ-crotonolactone (GCL), as it is formally the lactone derived from γ-hydroxyisocrotonic acid. The chemical is colloquially called "butenolide", and is the parent structure for th ...
, which has one fewer carbon atom in the ring.
References
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