7713. Pratensein

Nomenclature

CAS number: 2284-31-3
5,7-Dihydroxy-3-(3-hydroxy-4-methoxyphenyl)-4H-1-benzopyran-4-one; 3′,5,7-trihydroxy-4′-methoxyisoflavone.
C16H12O6; mol wt 300.26.
C 64.00%, H 4.03%, O 31.97%.

Description and references

Isoln from red clover (Trifolium pratense L., Leguminosae), structure and synthesis: E. Wong, J. Org. Chem. 28, 2336 (1963). Alternate syntheses: A. C. Jain, P. K. Bambab, Indian J. Chem. 26B, 488 (1987).

Chemical structure

Properties

Needles from ethanol, mp 272-273°. uv max (ethanol): 263 nm (log ε 4.53).

Derivative

Triacetylpratensein.
C22H18O9; mol wt 426.37.
C 61.97%, H 4.26%, O 33.77%.

Properties

White needles from chloroform, mp 175-177°.