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)
• 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
• InChIKey: YTIVTFGABIZHHX-UHFFFAOYSA-N

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
• 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: Yes
• HazardClass: 6.1
• PackingGroup: II
• HS Code: 29171990