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142-45-0

Name Acetylenedicarboxylic acid
CAS 142-45-0
EINECS(EC#) 205-536-0
Molecular Formula C4H2O4
MDL Number MFCD00004362
Molecular Weight 114.06
MOL File 142-45-0.mol
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Chemical Properties

Appearance cream coloured to beige crystalline powder or
Melting point  180-187 °C (dec.) (lit.)
Boiling point  133.5°C (rough estimate)
density  1.1794 (rough estimate)
refractive index  1.5260 (estimate)
Fp  131 °C
storage temp.  2-8°C
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)
NIST Chemistry Reference 2-Butynedioic acid(142-45-0)
EPA Substance Registry System 142-45-0(EPA Substance)

Safety Data

Hazard Codes  T,Xi
Risk Statements 
R25:Toxic if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S37/39:Wear suitable gloves and eye/face protection .
RIDADR  UN 2811 6.1/PG 3
WGK Germany  3
TSCA  Yes
HazardClass  6.1
PackingGroup  II
HS Code  29171990

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