The flavan-4-ols (3-deoxyflavonoids) are

flavone Flavone is an organic compound with the formula . A white solid, flavone is a derivative of chromone with a phenyl (Ph) substituent adjacent to the ether group. The compound is of little direct practical importance, but susbstituted derivatives, ...

-derived

alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of sev ...

s and a family of flavonoids. Flavan-4-ols are colorless precursor compounds that polymerize to form red phlobaphene pigments. They can be found in the sorghum. Glycosides (abacopterins A, B, C and D together with triphyllin A and 6,8-dimethyl-7-hydroxy-4‘-methoxyanthocyanidin-5-O-β-d-glucopyranoside) can be isolated from a

methanol Methanol (also called methyl alcohol and wood spirit, amongst other names) is an organic chemical and the simplest aliphatic alcohol, with the formula C H3 O H (a methyl group linked to a hydroxyl group, often abbreviated as MeOH). It is ...

extract of the rhizomes of ''

Abacopteris penangiana ''Menisciopsis penangiana'' is a fern species in the genus '' Menisciopsis''. It has many synonyms, including ''Abacopteris penangiana'' and ''Pronephrium penangianum''. Flavan-4-ols glycosides, abacopterins A, B, C and D together with tri ...

''.

Known flavan-4-ols

* Apiforol * Luteoforol

Metabolism

Flavanone 4-reductase In enzymology, a flavanone 4-reductase () is an enzyme that catalyzes the chemical reaction :(2S)-flavan-4-ol + NADP+ \rightleftharpoons (2S)-flavanone + NADPH + H+ Thus, the two substrates of this enzyme are (2S)-flavan-4-ol and NADP+, where ...

is an enzyme that uses (2''S'')-flavan-4-ol and NADP⁺ to produce (2''S'')-

flavanone The flavanones, a type of flavonoids, are various aromatic, colorless ketones derived from flavone that often occur in plants as glycosides. List of flavanones * Blumeatin * Butin * Eriodictyol * Hesperetin * Hesperidin * Homoeriodictyol * ...

, NADPH, and H⁺.

Spectral data

These compounds have absorption maxima of 564 nm.

References

{{flavan-4ol