Quinizarin

Also known as: 1,4-Dihydroxyanthraquinone, 1,4-Dihydroxy-9,10-anthracenedione, 1,4-Dihydroxy-9,10-anthraquinone, 1,4-Dihydroxyanthra-9,10-quinone, 1,4-Doa, 1,4-dihydroxy-10-anthracenedione, 1,4-dihydroxy-9,10(9H,10H)anthracenedione, 1,4-dihydroxyanthracene-9,10-dione, 1,4-hydroxyanthraquinone, 9,10-Anthracenedione, 1,4-dihydroxy-, CI 58050, CI NO 58050, Chinizarin, DSD ACID, EINECS 201-368-7, LABOTEST-BB LT00052844, MFCD00001209, QUINAZARIN, QUINIZARINE, Quinizalin

Quinizarin (CAS 81-64-1) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C14H8O4 and a molecular weight of 240.211 g/mol. Key properties include a melting point of 198-199 °C(lit.), a boiling point of 465.3±40.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 249.3±23.8 °C. It is classified under GHS with signal word Warning and hazard statements H410 — Very toxic to aquatic life with long lasting effects. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 81-64-1
Jingsj CID: J-35286-4
Molecular Formula: C₁₄H₈O₄
Molecular Weight: 240.211 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	198-199 °C(lit.)
Boiling Point	465.3±40.0 °C at 760 mmHg
Density	1.5±0.1 g/cm3
Flash Point	249.3±23.8 °C
Exact Mass	240.042252
PSA	74.60000
LogP	4.47
Additional Property	8.3 (vs air)
Vapor Pressure	0.0±1.2 mmHg at 25°C
Refractive Index	1.733
Additional Property	<1 g/L (20 ºC)

GHS Safety & Compliance

Environmental HazardSignal word: Warning

H410 — Very toxic to aquatic life with long lasting effects

Activity & Biological Data

Additional Information	[1]. Verebová V, et al. Anthraquinones quinizarin and danthron unwind negatively supercoiled DNA and lengthen linear DNA. Biochem Biophys Res Commun. 2014;444(1):50-55. [2]. Dominic Cheuk, et al. Investigation into solid and solution properties of quinizarin. [3]. Wang M, et al. Electrospun 1,4-DHAQ-doped cellulose nanofiber films for reusable fluorescence detection of trace Cu2+ and further for Cr3+. Environ Sci Technol. 2012;46(1):367-373.

Additional Information

[1]. Verebová V, et al. Anthraquinones quinizarin and danthron unwind negatively supercoiled DNA and lengthen linear DNA. Biochem Biophys Res Commun. 2014;444(1):50-55. [2]. Dominic Cheuk, et al. Investigation into solid and solution properties of quinizarin. [3]. Wang M, et al. Electrospun 1,4-DHAQ-doped cellulose nanofiber films for reusable fluorescence detection of trace Cu2+ and further for Cr3+. Environ Sci Technol. 2012;46(1):367-373.

Customs & Trade Information

HS Code	2914610000
Summary	2914610000 anthracene-9,10-dione。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。Lowest tariff:5.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Quinizarin?

The CAS number of Quinizarin is 81-64-1.

What are the molecular formula and molecular weight of Quinizarin?

Quinizarin has molecular formula C14H8O4 and molecular weight 240.211 g/mol.

Is Quinizarin hazardous?

Quinizarin has GHS signal word Warning and hazard statements H410 — Very toxic to aquatic life with long lasting effects.

What are the upstream and downstream products of Quinizarin?

For Quinizarin, Upstream Products: Phthalic anhydride, Hydroquinone, Phthaloyl chloride; Downstream Products: Anthracene-1,4,9,10-tetraol, 2,3-Dihydro-9,10-dihydroxy-1,4-anthracenedione, Quinizarin.

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. "Quinizarin (CAS 81-64-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-35286-4 (accessed 2026-11-06).

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