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Acetylenedicarboxylic acid Structure

Acetylenedicarboxylic acid

Chemical 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
form  Crystalline Powder or Crystals
pka pK1: 1.75; pK2: 4.40 (25°C)
color  White or cream to beige
Water Solubility  soluble
BRN  878357
InChIKey YTIVTFGABIZHHX-UHFFFAOYSA-N
CAS DataBase Reference 142-45-0(CAS DataBase Reference)
FDA UNII 2D2OJ4KO44
NIST Chemistry Reference 2-Butynedioic acid(142-45-0)
EPA Substance Registry System 2-Butynedioic acid (142-45-0)

Safety

Symbol(GHS)
Signal wordDanger
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
NFPA 704:
1
3 0

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