Title: Pratensein
CAS Registry Number: 2284-31-3
CAS Name: 5,7-Dihydroxy-3-(3-hydroxy-4-methoxyphenyl)-4H-1-benzopyran-4-one
Additional Names: 3¢,5,7-trihydroxy-4¢-methoxyisoflavone
Molecular Formula: C16H12O6
Molecular Weight: 300.26
Percent Composition: C 64.00%, H 4.03%, O 31.97%
Literature 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).
Properties: Needles from ethanol, mp 272-273°. uv max (ethanol): 263 nm (log e 4.53).
Melting point: mp 272-273°
Absorption maximum: uv max (ethanol): 263 nm (log e 4.53)
Derivative Type: Triacetylpratensein
Molecular Formula: C22H18O9
Molecular Weight: 426.37
Percent Composition: C 61.97%, H 4.26%, O 33.77%
Properties: White needles from chloroform, mp 175-177°.
Melting point: mp 175-177°
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