The flavan-4-ols (3-deoxyflavonoids) are flavone-derived alcohols and a family of flavonoids. Flavan-4-ols are colorless precursor compounds that polymerize to form red phlobaphene pigments.[1] They can be found in the sorghum.[2] 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 extract of the rhizomes of Abacopteris penangiana.[3]

Chemical structure of flavan-4-ol
IUPAC name
Preferred IUPAC name
3D model (JSmol)
  • C1C(C2=CC=CC=C2OC1C3=CC=CC=C3)O
Molar mass 226.275 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Known flavan-4-olsEdit


Flavanone 4-reductase is an enzyme that uses (2S)-flavan-4-ol and NADP+ to produce (2S)-flavanone, NADPH, and H+.

Spectral dataEdit

These compounds have absorption maxima of 564 nm.[4]


  1. ^ Styles and Ceska, 1977[full citation needed]
  2. ^ Jambunathan, Ramamurthi; Kherdekar, Milind S. (1991). "Flavan-4-ol concentration in leaf tissues of grain mold susceptible and resistant sorghum plants at different stages of leaf development" (PDF). Journal of Agricultural and Food Chemistry. 39 (6): 1163–1165. doi:10.1021/jf00006a035.
  3. ^ Zhao, Zhongxiang (2006). "Flavan-4-ol Glycosides from the Rhizomes of Abacopteris p enangiana". Journal of Natural Products. 69 (2): 265–268. doi:10.1021/np050191p.
  4. ^ Sekhon, Rajandeep S.; Chopra, Surinder (2009). "Progressive Loss of DNA Methylation Releases Epigenetic Gene Silencing from a Tandemly Repeated Maize Myb Gene". Genetics. 181: 81–91. doi:10.1534/genetics.108.097170. PMC 2621191.