Pharmaceutical Materials

Acetylenedicarboxylic acid

Pharmaceutical Materials 2025-03-02

CAS Number: 142-45-0

Molecular Formula: C4H2O4

Molecular Weight: 114.06 g/mol

Appearance: Cream to off-white crystalline powder

Melting Point: 180-187°C

Usage: As a precursor in organic synthesis, a pharmaceutical intermediate, and a laboratory reagent.

Aspect	Details
Name	Acetylenedicarboxylic Acid
Common Synonyms	2-Butynedioic Acid, Ethynedicarboxylic Acid, But-2-ynedioic Acid
CAS No.	142-45-0
Molecular Formula	C₄H₂O₄
Molecular Weight	114.06 g/mol
Physical Properties	Appearance: White to pale yellow crystalline powder Melting Point: 180-187 °C (decomposes) Solubility: Soluble in water, ethanol, and ethyl ether Density: Approx. 1.179 g/cm³ (estimated)
Chemical Properties	Strong acidic character (pKa₁ ≈ 1.75. pKa₂ ≈ 4.40) Highly reactive due to the triple bond and carboxylic acid groups Exists in both anhydrous and hydrated forms
Applications	Used as a pharmaceutical intermediate (e.g., synthesis of dimercaprol sodium) Employed in organic synthesis for preparing esters and metal complexes Utilized as an electrolyte in nanomaterial fabrication (e.g., anodic alumina)
Safety Information	Toxic (T); irritant (Xi) Handle with gloves and eye protection Store in a cool, dry place away from strong bases

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Acetylenedicarboxylic acid

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