5-Hydroxyflavone

Also known as: Primuletin, 5-hydroxy-2-phenyl-4H-chromen-4-one, 5-Hydroxy-2-phenylchromone, NSC 26745

5-Hydroxyflavone (CAS 491-78-1) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C15H10O3 and a molecular weight of 238.23800 g/mol. Key properties include a melting point of 158-160°C, a boiling point of 425ºC at 760 mmHg, a density of 1.34g/cm3 and a flash point of 165.4ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 491-78-1
Jingsj CID: J-39619-0
Molecular Formula: C₁₅H₁₀O₃
Molecular Weight: 238.23800 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	158-160°C
Boiling Point	425ºC at 760 mmHg
Density	1.34g/cm3
Flash Point	165.4ºC
Exact Mass	238.06300
PSA	50.44000
LogP	3.16560
Vapor Pressure	7.97E-08mmHg at 25°C
Refractive Index	1.666

Activity & Biological Data

Additional Information	[1]. Alexandra-Cristina Munteanu, et al. Synthesis, Characterization, Cytotoxic Activity, and Metabolic Studies of Ruthenium(II) Polypyridyl Complexes Containing Flavonoid Ligands. Inorg Chem. 2020 Apr 6;59(7):4424-4434.

Customs & Trade Information

HS Code	2932999099
Summary	2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5-Hydroxyflavone?

The CAS number of 5-Hydroxyflavone is 491-78-1.

What are the molecular formula and molecular weight of 5-Hydroxyflavone?

5-Hydroxyflavone has molecular formula C15H10O3 and molecular weight 238.23800 g/mol.

What are the upstream and downstream products of 5-Hydroxyflavone?

For 5-Hydroxyflavone, Upstream Products: 2',6'-Dihydroxyacetophenone, Benzoyl chloride, 2'-Fluoro-6'-hydroxyacetophenone; Downstream Products: 5-Methoxyflavone, 4',5-Dihydroxyflavone, 5,6-Dihydroxyflavone.

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-Hydroxyflavone (CAS 491-78-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-39619-0 (accessed 2026-11-09).

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