1,2-Cyclobutanedione

Also known as: 1,2-Cyclobutandion, 1,2-cyclobutadione, Cyclobutan-1,2-dion, cyclobutane-1,2-dione, cyclobutanedione

1,2-Cyclobutanedione (CAS 33689-28-0) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C4H4O2 and a molecular weight of 84.07340 g/mol. Key properties include a melting point of 65ºC, a boiling point of 155.7ºC at 760mmHg, a density of 1.314g/cm3 and a flash point of 48ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 33689-28-0
Jingsj CID: J-1026531-3
Molecular Formula: C₄H₄O₂
Molecular Weight: 84.07340 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	65ºC
Boiling Point	155.7ºC at 760mmHg
Density	1.314g/cm3
Flash Point	48ºC
Exact Mass	84.02110
PSA	34.14000
Refractive Index	1.496

Customs & Trade Information

HS Code	2914299000
Summary	2914299000. other cyclanic, cyclenic or cyclotherpenic ketones without other oxygen function. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:5.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 1,2-Cyclobutanedione?

The CAS number of 1,2-Cyclobutanedione is 33689-28-0.

What are the molecular formula and molecular weight of 1,2-Cyclobutanedione?

1,2-Cyclobutanedione has molecular formula C4H4O2 and molecular weight 84.07340 g/mol.

What are the upstream and downstream products of 1,2-Cyclobutanedione?

For 1,2-Cyclobutanedione, Upstream Products: Sodium ethoxide, Dicyclohexylamine, Diethylamine; Downstream Products: Methyl 1-hydroxycyclopropane-1-carboxylate, 1-Hydroxy-1-cyclopropanecarboxylic acid.

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. "1,2-Cyclobutanedione (CAS 33689-28-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1026531-3 (accessed 2026-11-09).

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