7190. Petunidin

Nomenclature

CAS number: 1429-30-7
2-(3,4-Dihydroxy-5-methoxyphenyl)-3,5,7-trihydroxy-1-benzopyrylium chloride; 3,3′,4′,5,7-pentahydroxy-5′-methoxyflavylium chloride; petunidol.
C16H13ClO7; mol wt 352.72.
C 54.48%, H 3.71%, Cl 10.05%, O 31.75%.

Description and references

The aglucone of petunin: Willst"atter, Burdick, Ann. 412, 217 (1917). Synthesis: Bradley et al., J. Chem. Soc. 1930, 793; Robinson, Robinson, Biochem. J. 25, 1687 (1931). Chromatographic separation: Spaeth, Rosenblatt, Anal. Chem. 22, 1321 (1950).

Chemical structure

Properties

Gray-brown leaflets or prisms from dil HCl.

Derivative

3,5-Diglucoside.

Nomenclature

CAS number: 25846-73-5
2-(3,4-Dihydroxy-5-methoxyphenyl)-3,5-bis(β-d-glucopyranosyloxy)-7-hydroxy-1-benzopyrylium chloride; petunin.
C28H33ClO17; mol wt 677.00.
C 49.67%, H 4.91%, Cl 5.24%, O 40.18%.

Description and references

From Petunia hybrida Hort., Solanaceae: Willst"atter, Burdick, loc. cit. Synthesis: Bell, Robinson, J. Chem. Soc. 1934, 1604.

Properties

Violet plates with a coppery luster from dil HCl, mp ≈178°. Absorption max (methanolic HCl): 540 nm.