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3-Hydroxy-5-methoxyflavone

3-羟基-5-甲氧基黄酮

Also known as: 3-Hydroxy-5-methoxy-2-phenyl-4H-chromen-4-one, 5-Methoxyflavonol, 5-methoxy-3-hydroxyflavone, METHOXYFLAVONOL,5-, 3-HYDROXY-5-METHOXYFLAVONE, 4H-1-Benzopyran-4-one, 3-hydroxy-5-methoxy-2-phenyl-

3-Hydroxy-5-methoxyflavone (CAS 6665-81-2) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C16H12O4 and a molecular weight of 268.26400 g/mol. It is also known as 3-Hydroxy-5-methoxy-2-phenyl-4H-chromen-4-one, 5-Methoxyflavonol and 5-methoxy-3-hydroxyflavone. Key properties include a melting point of 173-176ºC, a boiling point of 448ºC at 760 mmHg, a density of 1.353g/cm3 and a flash point of 170ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
6665-81-2
Jingsj CID
J-20073-2
Molecular Formula
C16H12O4
Chinese Name
3-羟基-5-甲氧基黄酮
Molecular Weight
268.26400 g/mol
Category
Ketones
Last updated
8/21/2026

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Physicochemical Properties

Melting Point173-176ºC
Boiling Point448ºC at 760 mmHg
Density1.353g/cm3
Flash Point170ºC

Frequently Asked Questions

What is the CAS number of 3-Hydroxy-5-methoxyflavone?

The CAS number of 3-Hydroxy-5-methoxyflavone is 6665-81-2.

What are the molecular formula and molecular weight of 3-Hydroxy-5-methoxyflavone?

3-Hydroxy-5-methoxyflavone has molecular formula C16H12O4 and molecular weight 268.26400 g/mol.

Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "3-Hydroxy-5-methoxyflavone (CAS 6665-81-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-20073-2 (accessed 2026-10-23).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.