3,4-Dimethoxy-3-cyclobutene-1,2-dione

3,4-二甲氧基-3-环丁烯-1,2-二酮

Also known as: Dimethyl squarate, Squaric acid dimethyl ester, 3,4-Dimethoxycyclobut-3-ene-1,2-dione, Dimethyl 3,4-dioxocyclobut-1-ene-1,2-dicarboxylate, 1,2-Dimethoxy-3,4-dioxocyclobut-1-ene, 3-Cyclobutene-1,2-dione, 3,4-dimethoxy-

3,4-Dimethoxy-3-cyclobutene-1,2-dione (CAS 5222-73-1) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C6H6O4 and a molecular weight of 142.109 g/mol. It is also known as Dimethyl squarate, Squaric acid dimethyl ester and 3,4-Dimethoxycyclobut-3-ene-1,2-dione. Key properties include a melting point of 55-57 °C(lit.), a boiling point of 286.1±50.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 128.0±30.2 °C. GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

5222-73-1

Jingsj CID

J-35968-1

Molecular Formula

C₆H₆O₄

Chinese Name

3,4-二甲氧基-3-环丁烯-1,2-二酮

Molecular Weight

142.109 g/mol

Category

Ketones

Last updated

8/21/2026