5,6-Dihydroxyflavone

Also known as: 4H-1-Benzopyran-4-one, 5,6-dihydroxy-2-phenyl-, 5,6-Dihydroxy-2-phenylchromen-4-one

5,6-Dihydroxyflavone (CAS 6665-66-3) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C15H10O4 and a molecular weight of 254.23700 g/mol. Key properties include a boiling point of 494.399ºC at 760 mmHg, a density of 1.443g/cm3 and a flash point of 193.53ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 6665-66-3
Jingsj CID: J-25145-6
Molecular Formula: C₁₅H₁₀O₄
Molecular Weight: 254.23700 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	494.399ºC at 760 mmHg
Density	1.443g/cm3
Flash Point	193.53ºC
Exact Mass	254.05800
PSA	70.67000
LogP	2.87120
Refractive Index	1.699

Customs & Trade Information

HS Code	2914400090
Summary	2914400090 other ketone-alcohols and ketone-aldehydes。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 5,6-Dihydroxyflavone?

The CAS number of 5,6-Dihydroxyflavone is 6665-66-3.

What are the molecular formula and molecular weight of 5,6-Dihydroxyflavone?

5,6-Dihydroxyflavone has molecular formula C15H10O4 and molecular weight 254.23700 g/mol.

What are the upstream and downstream products of 5,6-Dihydroxyflavone?

For 5,6-Dihydroxyflavone, Upstream Products: 6-Hydroxyflavone, 5-Hydroxyflavone, 2'-Hydroxy-6'-methoxyacetophenone.

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

Last updated: 8/21/2026

How to cite: Jingsj. "5,6-Dihydroxyflavone (CAS 6665-66-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-25145-6 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.