Acetylenedicarboxylic acid , 95% , 142-45-0

Synonym(s):
2-Butynedioic acid;Acetylenedicarboxylic acid;Butynedioic acid

CAS NO.：142-45-0

Empirical Formula: C4H2O4

Molecular Weight: 114.06

MDL number: MFCD00004362

EINECS: 205-536-0

PRODUCT Properties

• Melting point: 180-187 °C (dec.) (lit.)
• Boiling point: 133.5°C (rough estimate)
• Density: 1.1794 (rough estimate)
• bulk density: 550kg/m3
• refractive index: 1.5260 (estimate)
• Flash point: 131 °C
• storage temp.: 2-8°C
• solubility: Methanol (Slightly), Water
• pka: pK1: 1.75; pK2: 4.40 (25°C)
• form: Crystalline Powder or Crystals
• color: White or cream to beige
• Water Solubility: soluble
• BRN: 878357
• InChI: 1S/C4H2O4/c5-3(6)1-2-4(7)8/h(H,5,6)(H,7,8)
• InChIKey: YTIVTFGABIZHHX-UHFFFAOYSA-N
• SMILES: OC(=O)C#CC(O)=O
• CAS DataBase Reference: 142-45-0(CAS DataBase Reference)
• NIST Chemistry Reference: 2-Butynedioic acid(142-45-0)
• EPA Substance Registry System: 2-Butynedioic acid (142-45-0)

Description and Uses

Acetylenedicarboxylic acid is employed in the preparation of dimethyl acetylenedicarboxylate and potassium hydrogenacetylenedicarboxylate. It is also used as a laboratory reagent. Further, it is used as a precursor in organic synthesis and also serves as a pharmaceutical intermediate.

Safety

• Symbol(GHS): GHS06
• Signal word: Danger
• Hazard statements: H301-H315-H319-H335
• Precautionary statements: P261-P264-P270-P301+P310-P302+P352-P305+P351+P338
• target organs: Respiratory system
• PPE: Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges
• Hazard Codes: T,Xi
• Risk Statements: 25-36/37/38
• Safety Statements: 26-45-37/39
• RIDADR: UN 2811 6.1/PG 3
• WGK Germany: 3
• TSCA: TSCA listed
• HazardClass: 6.1
• PackingGroup: II
• HS Code: 29171990
• Storage Class: 6.1C - Combustible acute toxic Cat.3; toxic compounds or compounds which causing chronic effects
• Hazard Classifications: Acute Tox. 3 Oral; Eye Irrit. 2; Skin Irrit. 2; STOT SE 3