4,5-Dimethoxy-1,2-benzoquinone

Also known as: 4,5-DIMETHOXY-O-BENZOQUINONE, 4,5-Dimethoxy-3,5-cyclohexadiene-1,2-dione, 4,5-Dimethoxy-o-benzoquinone, 4,5-Dimethoxycyclohexa-3,5-diene-1,2-dione, 3,5-Cyclohexadiene-1,2-dione, 4,5-dimethoxy-, NSC121600

4,5-Dimethoxy-1,2-benzoquinone (CAS 21086-65-7) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C8H8O4 and a molecular weight of 168.14700 g/mol. Key properties include a melting point of 226-230ºC, a boiling point of 324.3ºC at 760mmHg, a density of 1.24g/cm3 and a flash point of 146.2ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 21086-65-7
Jingsj CID: J-1520005-2
Molecular Formula: C₈H₈O₄
Molecular Weight: 168.14700 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	226-230ºC
Boiling Point	324.3ºC at 760mmHg
Density	1.24g/cm3
Flash Point	146.2ºC
Exact Mass	168.04200
PSA	52.60000
LogP	0.19880
Vapor Pressure	0.000247mmHg at 25°C
Refractive Index	1.503

Customs & Trade Information

HS Code	2914690090
Summary	2914690090 other quinones。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 4,5-Dimethoxy-1,2-benzoquinone?

The CAS number of 4,5-Dimethoxy-1,2-benzoquinone is 21086-65-7.

What are the molecular formula and molecular weight of 4,5-Dimethoxy-1,2-benzoquinone?

4,5-Dimethoxy-1,2-benzoquinone has molecular formula C8H8O4 and molecular weight 168.14700 g/mol.

What are the upstream and downstream products of 4,5-Dimethoxy-1,2-benzoquinone?

For 4,5-Dimethoxy-1,2-benzoquinone, Upstream Products: Methanol, Phenol, 4,5-Dimethoxycatechol; Downstream Products: 1,2,4,5-Tetramethoxybenzene, 2,5-Dihydroxy-1,4-benzoquinone, Ilimaquinone.

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. "4,5-Dimethoxy-1,2-benzoquinone (CAS 21086-65-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1520005-2 (accessed 2026-11-09).

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