Rhamnetin

CAS No.：90-19-7

Important Notice

This product is a chemical product/pharmaceutical intermediate. It is not a drug, an active pharmaceutical ingredient (API), or a pharmaceutical-grade material. It has not been granted a drug approval number or a Chemical Drug Substance Approval Notice, has not passed drug-related review and approval, and is not manufactured, tested, or released in accordance with pharmaceutical GMP.
This product is intended solely for non-clinical research, process development, quality studies, further chemical processing, or chemical synthesis. It must not be used in drug-product manufacturing, clinical trials, clinical diagnosis, or administration to humans or animals, or be sold, used as an input, submitted for regulatory filing, or released as an API or pharmaceutical material.
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Rhamnetin Basic information

Product Name:	Rhamnetin
Synonyms:	7-methoxyquercetin;7-o-methylquercetin;beta-rhamnocitrin;c.i.75690;3,3,4,5-TETRAHYDROXY-7-METHOXYFLAVONE TECH GRADE;RHAMNETIN WITH HPLC;2-(3,4-Dihydroxyphenyl)-3,5-dihydroxy-7-methoxy-4H-1-benzopyran-4-one;7-Methoxyquercetin
CAS:	90-19-7
MF:	C16H12O7
MW:	316.26
EINECS:	201-974-1
Product Categories:	standard material,plant extracts;Inhibitors;Aromatics;Intermediates & Fine Chemicals;Metabolites & Impurities;Pharmaceuticals;Flavanols;Heterocycles
Mol File:	90-19-7.mol

Rhamnetin Chemical Properties

Melting point	293-296°C (dec.)
Boiling point	375.7°C (rough estimate)
density	1.3347 (rough estimate)
refractive index	1.4790 (estimate)
storage temp.	2-8°C
solubility	DMSO (Slightly), Methanol (Slightly, Heated)
form	neat
color	Light Yellow to Dark Yellow
BRN	47741
Stability:	Hygroscopic
CAS DataBase Reference	90-19-7(CAS DataBase Reference)

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38
Safety Statements	26-36/37
WGK Germany	3
RTECS	LK8748000
F	3-10

MSDS Information

Provider	Language
3,5,3',4'-Tetrahydroxy-7-methoxyflavone	English
SigmaAldrich	English

Rhamnetin Usage And Synthesis

Uses	O-Methylated metabolite of the flavanoid Quercertin (Q509500) with antioxidant activity.
Definition	ChEBI: A monomethoxyflavone that is quercetin methylated at position 7.
Purification Methods	Crystallise rhamnetin from EtOH (m 292-293o), aqueous EtOH (m 294-296o) or MeOH (m 290-294o). or Me2CO/MeOH. [Kuhn & Low Chem Ber 77 211 1944, Jurd J Am Chem Soc 80 5531 1958.] The tetra-acetate has m 189-190o (from Me2CO/MeOH). [Beilstein 18 H 245, 18 II 237, 18 III/IV 3474.]

Rhamnetin Preparation Products And Raw materials

Raw materials	4H-1-Benzopyran-4-one, 3-[(6-deoxy-α-L-mannopyranosyl)oxy]-2-(3,4-dihydroxyphenyl)-5-hydroxy-7-methoxy--->Quercetin 3,3’,4’,5-Tetraacetate-->2-(2,2-Diphenyl-1,3-benzodioxol-5-yl)-5,7-dihydroxy-3-(phenylmethoxy)-4H-1-benzopyran-4-one-->2-(2,2-diphenylbenzo[d][1,3]dioxol-5-yl)-3,5,7-trihydroxy-4H-chroMen-4-one-->Quercetin-->Dimethyl sulfate-->Iodomethane
Preparation Products	3,7-DIMETHOXY-3',4',5-TRIHYDROXYFLAVONE-->4',7-DIMETHOXY-3,3',5-TRIHYDROXYFLAVONE-->3-O-Methylquercetin-->TAMARIXETIN

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