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

Also known as: Squaric acid dichloride, Squaryl dichloride, Dichlorocyclobutenedione, 3,4-Dichlorocyclobut-3-ene-1,2-dione, 1,2-Dichloro-1-cyclobutene-3,4-dione, Quadratic acid dichloride, 3-Cyclobutene-1,2-dione, 3,4-dichloro-

3,4-Dichloro-3-cyclobutene-1,2-dione (CAS 2892-63-9) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C4Cl2O2 and a molecular weight of 150.94800 g/mol. Key properties include a boiling point of 175.6ºC at 760mmHg and a density of 1.74g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 2892-63-9
Jingsj CID: J-1498989-0
Molecular Formula: C₄Cl₂O₂
Molecular Weight: 150.94800 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	175.6ºC at 760mmHg
Density	1.74g/cm3
Exact Mass	149.92800
PSA	34.14000
LogP	0.82740
Vapor Pressure	1.14mmHg at 25°C
Refractive Index	1.556

Customs & Trade Information

HS Code	2914700090
Summary	HS: 2914700090 halogenated, sulphonated, nitrated or nitrosated derivatives of ketones and quinones, whether or not with other oxygen function Tax rebate rate:9.0% Supervision conditions:none VAT:17.0% MFN tariff:5.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3,4-Dichloro-3-cyclobutene-1,2-dione?

The CAS number of 3,4-Dichloro-3-cyclobutene-1,2-dione is 2892-63-9.

What are the molecular formula and molecular weight of 3,4-Dichloro-3-cyclobutene-1,2-dione?

3,4-Dichloro-3-cyclobutene-1,2-dione has molecular formula C4Cl2O2 and molecular weight 150.94800 g/mol.

What are the upstream and downstream products of 3,4-Dichloro-3-cyclobutene-1,2-dione?

For 3,4-Dichloro-3-cyclobutene-1,2-dione, Upstream Products: Squaric acid, Oxalyl chloride, 2,3,4,4-tetrachlorocyclobut-2-en-1-one; Downstream Products: 1,4-Bis(trimethylsilyl)-1,3-butadiyne, 3,4-Bis(cyclohexylamino)cyclobut-3-ene-1,2-dione, 3-Chloro-4-isopropoxycyclobut-3-ene-1,2-dione.

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. "3,4-Dichloro-3-cyclobutene-1,2-dione (CAS 2892-63-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1498989-0 (accessed 2026-11-09).

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