Quercetagetin
Title: Quercetagetin
CAS Registry Number: 90-18-6
CAS Name: 2-(3,4-Dihydroxyphenyl)-3,5,6,7-tetrahydroxy-4H-1-benzopyran-4-one
Additional Names: 3,3¢,4¢,5,6,7-hexahydroxyflavone; 6-hydroxycyanidenolon 1555
Molecular Formula: C15H10O8
Molecular Weight: 318.24
Percent Composition: C 56.61%, H 3.17%, O 40.22%
Literature References: From flowers of French marigold, Tagetes patula Linn., Compositae: Perkin, J. Chem. Soc. 103, 209 (1913). Synthesis: Baker et al., ibid. 1929, 74; Rao, Seshadri, Proc. Indian Acad. Sci. 23A, 23 (1946), C.A. 40, 50522 (1946).
 
Derivative Type: Dihydrate
Properties: Pale yellow needles from dil alcohol, mp 318°. uv max (alc): 259, 361 nm (log e 4.23, 4.34). Sol in hot alcohol; sparingly sol in boiling water.
Melting point: mp 318°
Absorption maximum: uv max (alc): 259, 361 nm (log e 4.23, 4.34)
 
Derivative Type: Hexaacetate
Molecular Formula: C27H22O14
Molecular Weight: 570.46
Percent Composition: C 56.85%, H 3.89%, O 39.27%
Properties: Needles from alcohol + acetic acid, mp 209-211°. Sparingly sol in alc.
Melting point: mp 209-211°
 
Derivative Type: 7-Glucoside
Additional Names: Quercetagitrin
Molecular Formula: C21H20O13
Molecular Weight: 480.38
Percent Composition: C 52.51%, H 4.20%, O 43.30%
Literature References: From flowers of the African marigold, Tagetes erecta L., Compositae: Rao, Seshadri, Proc. Indian Acad. Sci. 14A, 289 (1941), C.A. 36, 25553 (1942); from Chrysanthemum coronarium L., Compositae: Anyas, Steelink, Arch. Biochem. Biophys. 90, 63 (1960). Structure: Rajagopalan, Seshadri, Proc. Indian Acad. Sci. 28A, 31 (1948), C.A. 43, 4265b (1949).
Properties: Crystals from aqueous pyridine, dec 236-238°. uv max (95% ethanol): 260, 272, 362 nm.
Absorption maximum: uv max (95% ethanol): 260, 272, 362 nm

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