Title: Daidzein
CAS Registry Number: 486-66-8
CAS Name: 7-Hydroxy-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one
Additional Names: 4¢,7-dihydroxyisoflavone
Molecular Formula: C15H10O4
Molecular Weight: 254.24
Percent Composition: C 70.86%, H 3.96%, O 25.17%
Literature References: The aglucon of daidzin, prepd by hydrolysis with HCl in methanol: Walz, Ann. 489, 118 (1931). Isoln from red clover: Wong, J. Sci. Food Agric. 13, 304 (1962); from the mold Micromonospora halophytica: Ganguly, Sarre, Chem. Ind. (London) 1970, 201. Synthesis: Baker et al., J. Chem. Soc. 1933, 274; Wessely et al., Ber. 66, 685 (1933); Mahal et al., J. Chem. Soc. 1934, 1769; Baker et al., ibid. 1953, 1852; Farkas, Ber. 90, 2940 (1957). Biosynthetic study: Grisebach, Zilg, Z. Naturforsch. 23b, 494 (1968).
Properties: Pale-yellow prisms from dil alc, dec 315-323°. uv max: 250 nm (log e 4.44). Sol in alcohol, ether.
Absorption maximum: uv max: 250 nm (log e 4.44)
Derivative Type: 7-Glucoside
Additional Names: Daidzin
Molecular Formula: C21H20O9
Molecular Weight: 416.38
Percent Composition: C 60.58%, H 4.84%, O 34.58%
Literature References: Isoln from soybean meal (Soja hispida): Walz, loc. cit. Synthesis: Farkas, Várady, Ber. 92, 819 (1959).
Properties: Monohydrate, needles from water, dec 234-236°. [a]D20 -36.4° (0.02N NaOH). Sol in water and aq alcohol.
Optical Rotation: [a]D20 -36.4° (0.02N NaOH)
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