CAS No 491-50-9 , 2-(3,4-dihydroxyphenyl)-3,5-dihydroxy-7-[(2S,3R,4S,5S,6R)-3,4,
5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-4-one

Title: Quercimeritrin
CAS Registry Number: 491-50-9
CAS Name: 2-(3,4-Dihydroxyphenyl)-7-(b-D-glucopyranosyloxy)-3,5-dihydroxy-4H-1-benzopyran-4-one
Synonyms: quercetin-7-D-glucoside; 3,3￠,4￠,5,7-pentahydroxyflavone-7-D-glucoside
Molecular Formula: C21H20O12
Molecular Weight: 464.38
Percent Composition: C 54.31%, H 4.34%, O 41.34%
Literature References: Found in flowers of Gossypium herbaceum L., Malvaceae: Perkin, J. Chem. Soc. 95, 2181 (1909); from leaves of Chrysanthemum ségetum L. and C. coronarium L., Compositae: Geissman, Steelink, J. Org. Chem. 22, 946 (1957); Anyas, Steelink, Arch. Biochem. Biophys. 90, 63 (1960). In the mother liquor from quercimeritrin the glucosides gossypitrin and isoquercitrin, q.v., are also found. Structure: Attree, Perkin, J. Chem. Soc. 1927, 234; Rao, Seshadri, Proc. Indian Acad. Sci. 9A, 365 (1939), C.A. 34, 1071 (1940); Pacheco, Grouiller, Compt. Rend. 253, 1178 (1961).
 
Derivative Type: Trihydrate
Properties: Yellow plates from aq pyridine. The water of crystn is given up at 100°, the anhydr material is hygroscopic, mp 247-249°. uv max (ethanol): 372, 257 nm (log e 4.33, 4.38). Practically insol in cold water, more sol in hot water; sol in methanol. Sol in aq alkaline solns with deep yellow color. Is hydrolyzed by 7% H2SO4 yielding 1 mol quercetin and 1 mol D-glucose.
Melting point: mp 247-249°
Absorption maximum: uv max (ethanol): 372, 257 nm (log e 4.33, 4.38)
 
Derivative Type: Gossypitrin
Molecular Formula: C21H20O13
Molecular Weight: 480.38
Percent Composition: C 52.51%, H 4.20%, O 43.30%
Properties: Orange-yellow needles melting at 200-202°; slightly sol in alcohol and acetic acid.