Article · Wikipedia archive · Last revised Jul 27, 2026

Azalein

Azalein is a chemical compound. It is a flavonol, a type of flavonoid. It is the 3-O-α-L-rhamnoside of azaleatin. It can be found in the flowers of Plumbago and Rhododendron species.

Last revised
Jul 27, 2026
Read time
≈ 1 min
Length
158 w
Citations
1
Source
Wikipedia ↗
Azalein
Azalein structure
Azalein structure source ↗
Names
IUPAC name
3′,4′,5-Trihydroxy-7-methoxy-3-(α-L-rhamnopyranosyloxy)flavone
Systematic IUPAC name
2-(3,4-Dihydroxyphenyl)-5-hydroxy-7-methoxy-3-{[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxy}-4H-1-benzopyran-4-one
Other names
Azaleatin 3-O-α-L-rhamnoside
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/C22H22O11/c1-8-16(26)18(28)19(29)22(31-8)33-21-17(27)15-13(30-2)6-10(23)7-14(15)32-20(21)9-3-4-11(24)12(25)5-9/h3-8,16,18-19,22-26,28-29H,1-2H3/t8-,16-,18+,19+,22-/m0/s1 checkY
    Key: FYSMTINDJSASRR-UFGFRKJLSA-N checkY
  • InChI=1/C22H22O11/c1-8-16(26)18(28)19(29)22(31-8)33-21-17(27)15-13(30-2)6-10(23)7-14(15)32-20(21)9-3-4-11(24)12(25)5-9/h3-8,16,18-19,22-26,28-29H,1-2H3/t8-,16-,18+,19+,22-/m0/s1
    Key: FYSMTINDJSASRR-UFGFRKJLBS
  • CC1C(C(C(C(O1)OC2=C(OC3=CC(=CC(=C3C2=O)OC)O)C4=CC(=C(C=C4)O)O)O)O)O
Properties
C22H22O11
Molar mass 462.407 g·mol−1
Density 1.683 g/mL
Melting point 181 to 185 °C (358 to 365 °F; 454 to 458 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Azalein is a chemical compound. It is a flavonol, a type of flavonoid. It is the 3-O-α-L-rhamnoside of azaleatin. It can be found in the flowers of Plumbago and Rhododendron species.1

References

References

  1. Harborne, JB (January 1962). "Plant polyphenols. 5. Occurrence of azalein and related pigments in flowers of Plumbago and Rhododendron species". Arch. Biochem. Biophys. 96: 171–8. doi:10.1016/0003-9861(62)90467-8. PMID 13904580.