Squaric acid, 98%

About Squaric acid, 98%

Squaric acid is a phenolic building block in Synthesis grade carrying the CAS registry number 2892-51-5 at a purity of 98%. Its molecular formula is C4H2O4 and its molecular weight is 114.06 g/mol. Systematically, it is named 3,4-dihydroxycyclobut-3-ene-1,2-dione. Alternative names: 3,4-Dihydroxy-3-cyclobutene-1,2-dione and Quadratic acid.

It is supplied as white to light yellow powder or crystals. Reported physical data include a melting point of above 300 °C. Keep the container tightly sealed and store it in a cool, dry area. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

Key uses span fine chemical synthesis and dyes and pigments manufacture. Buyers come mainly from pharmaceutical manufacturing, academic and industrial research and textiles and dyeing.

Standard pack sizes are 5 g, 25 g, 100 g and 5 x 1 kg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Fine chemical synthesis
Dyes & pigments manufacture

Industries

Specifications & identifiers

Chemical identifiers
Product name	Squaric acid, 98%
Catalogue No.	VQ-010214
CAS Number	2892-51-5
IUPAC name	3,4-dihydroxycyclobut-3-ene-1,2-dione
Molecular formula	C₄H₂O₄
Molecular weight	114.06 g/mol
Exact mass	113.9953
Grade	Synthesis
Purity / assay	98%
HSN code	29144000
InChIKey	PWEBUXCTKOWPCW-UHFFFAOYSA-N
SMILES	C1(=C(C(=O)C1=O)O)O
PubChem CID	17913

Physical properties
Physical form	Crystalline
Appearance	White to light yellow powder or crystals
Melting point	>300 °C
LogP (XLogP3)	-0.7
H-bond donors / acceptors	2 / 4
TPSA	74.6 Å²
Synonyms	3,4-Dihydroxy-3-cyclobutene-1,2-dione, Quadratic acid, 1,2-Diketo-3,4-dihydroxycyclobutene, Dihydroxycyclobutenedione, 3-Cyclobutene-1,2-dione, 3,4-dihydroxy-, dihydroxycyclobut-3-ene-1,2-dione, Cyclobutenedione, dihydroxy-, 1,2-Dihydroxycyclobutene-3,4-dione, 1,2-Dihydroxycyclobutenedione, 3,4-Dihydroxy-cyclobutene-1,2-dione, Diketocyclobutenediol, 4-08-00-02701 (Beilstein Handbook Reference)

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H315Causes skin irritation
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P264, P264 + P265, P271, P272, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P333 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Squaric acid, 98%?

The CAS Registry Number of Squaric acid, 98% is 2892-51-5. It is also known as 3,4-Dihydroxy-3-cyclobutene-1,2-dione, Quadratic acid, 1,2-Diketo-3,4-dihydroxycyclobutene.

What is the molecular formula and molecular weight of Squaric acid, 98%?

Squaric acid, 98% has the molecular formula C4H2O4 and a molecular weight of 114.06 g/mol. Its IUPAC name is 3,4-dihydroxycyclobut-3-ene-1,2-dione.

Which grade and pack sizes of Squaric acid, 98% can I order?

We supply Squaric acid, 98% in Synthesis (98%) grade, in 5 g, 25 g, 100 g, 5 x 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Squaric acid, 98%?

Yes. Every lot of Squaric acid, 98% is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Squaric acid, 98% be shipped internationally?

Yes. Squaric acid, 98% is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.