Squaric acid , 98% , 2892-51-5

Synonym(s):
Squaric acid

CAS NO.：2892-51-5

Empirical Formula: C4H2O4

Molecular Weight: 114.06

MDL number: MFCD00001334

EINECS: 220-761-4

PRODUCT Properties

• Melting point: >300 °C(lit.)
• Boiling point: 250.96°C
• Density: 1.82 g/cm3
• refractive index: 1.5800 (estimate)
• Flash point: 190 °C
• storage temp.: Inert atmosphere,Room Temperature
• solubility: 20g/l
• pka: 1.5??(at 25℃)
• form: Crystalline Powder
• color: White to beige
• PH: 1 (1g/l, H2O, 20℃)
• Water Solubility: 20 g/L (30 ºC)
• Merck: 14,8769
• BRN: 774275
• InChIKey: PWEBUXCTKOWPCW-UHFFFAOYSA-N
• CAS DataBase Reference: 2892-51-5(CAS DataBase Reference)
• NIST Chemistry Reference: 3-Cyclobutene-1,2-dione, 3,4-dihydroxy-(2892-51-5)
• EPA Substance Registry System: 3-Cyclobutene-1,2-dione, 3,4-dihydroxy- (2892-51-5)

Description and Uses

Squaric acid used as intermediate for squaraine dyes and heterocycles. Squaric acid is an immunotherapy used to treat common warts. This treatment is non-toxic, and easy to use. The treatment activated your immune system to combat the warts and therefore it may cause an allergic reaction , similar to poison oak. This reaction can be managed with a topical cortisone cream. Blistering and lightening of the skin may occur, but rarely.
Squaric acid derivatives – synthetic targets for ring expansion reactions

Safety

• Symbol(GHS): GHS05
• Signal word: Danger
• Hazard statements: H314
• Precautionary statements: P260-P280-P301+P330+P331-P303+P361+P353-P304+P340+P310-P305+P351+P338
• Hazard Codes: Xi
• Risk Statements: 36/37/38-43
• Safety Statements: 26-36-37/39
• RIDADR: 3261
• WGK Germany: 3
• RTECS: GU1800000
• Hazard Note: Irritant
• TSCA: Yes
• HazardClass: 8
• PackingGroup: II
• HS Code: 29144090