Flavan-3,4-diol

Leucoanthocyanidin
Names

IUPAC name 2-phenyl-3,4-dihydro-2H-chromene-3,4-diol
Other names Flavan-3,4-diol
Identifiers
3D model (Jmol)	Interactive image
PubChem CID	5318979
SMILES C1=CC=C(C=C1)C2C(C(C3=CC=CC=C3O2)O)O
Properties
Chemical formula	C₁₅H₁₄O₃
Molar mass	242.26 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y (what is ^YN ?)
Infobox references

Leucoanthocyanidin (flavan-3,4-diols) are colorless chemical compounds related to anthocyanidins and anthocyanins. Leucoanthocyanins can be found in Anadenanthera peregrina and in several species of Nepenthes including N. burbidgeae, N. muluensis, N. rajah, N. tentaculata, and N. × alisaputrana.

Such compounds include:

Leucoanthocyanidins have been demonstrated to be intermediates in anthocyanidin biosynthesis in flowers of Matthiola incana.

Bate-smith recommended in 1954 the use of the Forestal solvent for the isolation of leuco-anthocyanins.

Leucoanthocyanidin dioxygenase uses flavan-3,4-diols to produce 3-hydroxyanthocyanidins. The gene encoding the enzyme (PpLDOX) has been identified in peach and expression has been studied in Vitis vinifera.