3,4-Dimethoxy-3-cyclobutene-1,2-dione
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. 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. It is classified under GHS with signal word Danger and hazard statements H317 — May cause an allergic skin reaction and H334 — May cause allergy or asthma symptoms if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 5222-73-1
- Jingsj CID
- J-35968-2
- Molecular Formula
- C6H6O4
- Molecular Weight
- 142.109 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 55-57 °C(lit.) |
|---|---|
| Boiling Point | 286.1±50.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 128.0±30.2 °C |
| Exact Mass | 142.026611 |
| PSA | 52.60000 |
| LogP | -1.21 |
| Vapor Pressure | 0.0±0.6 mmHg at 25°C |
| Refractive Index | 1.478 |
GHS Safety & Compliance
- H317 — May cause an allergic skin reaction
- H334 — May cause allergy or asthma symptoms if inhaled
Customs & Trade Information
| HS Code | 2914509090 |
|---|---|
| Summary | HS:2914509090 other ketones with other oxygen function VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:5.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 3,4-Dimethoxy-3-cyclobutene-1,2-dione?
The CAS number of 3,4-Dimethoxy-3-cyclobutene-1,2-dione is 5222-73-1.
What are the molecular formula and molecular weight of 3,4-Dimethoxy-3-cyclobutene-1,2-dione?
3,4-Dimethoxy-3-cyclobutene-1,2-dione has molecular formula C6H6O4 and molecular weight 142.109 g/mol.
Is 3,4-Dimethoxy-3-cyclobutene-1,2-dione hazardous?
3,4-Dimethoxy-3-cyclobutene-1,2-dione has GHS signal word Danger and hazard statements H317 — May cause an allergic skin reaction; H334 — May cause allergy or asthma symptoms if inhaled.
What are the upstream and downstream products of 3,4-Dimethoxy-3-cyclobutene-1,2-dione?
For 3,4-Dimethoxy-3-cyclobutene-1,2-dione, Upstream Products: Triethyl orthoformate, Squaric acid, Trimethyl orthoformate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3,4-Dimethoxy-3-cyclobutene-1,2-dione (CAS 5222-73-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-35968-2 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.