| Identification | More | [Name]
Acetylenedicarboxylic acid | [CAS]
142-45-0 | [Synonyms]
2-BUTYNE-1,4-DIOIC ACID
2-BUTYNEDIOIC ACID
ACETYLENEDICARBOXYLIC ACID
BUTYNEDIOIC ACID
Acetaylenedicarboxylic Acid
ACETYLENEDICARBOXYLIC ACID FREE ACID
BUTYNEDIOIC ACID ACETYLENE DICARBOXYLIC ACID 99%
Acetylenedicarboxylic acid,98%
Acetylen-dicarbonsαure
But-2-ynedioic acid
2-Butynedioate
NSC-1903
NSC-631597 | [EINECS(EC#)]
205-536-0 | [Molecular Formula]
C4H2O4 | [MDL Number]
MFCD00004362 | [Molecular Weight]
114.06 | [MOL File]
142-45-0.mol |
| Chemical Properties | Back Directory | [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
| [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) | [NIST Chemistry Reference]
2-Butynedioic acid(142-45-0) | [EPA Substance Registry System]
142-45-0(EPA Substance) |
| Safety Data | Back Directory | [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 |
| Hazard Information | Back Directory | [Chemical Properties]
cream coloured to beige crystalline powder or | [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. | [Definition]
ChEBI: An acetylenic compound that is acetylene in which the hydrogens are replaced by carboxy groups. | [Purification Methods]
The acid is soluble in Et2O and crystallises from Et2O/pet ether (m 183-183.5o), or H2O as the dihydrate which dehydrates in a desiccator over conc H2SO4 in a vacuum. The dipicrate crystallises from aqueous ether. For the mono K salt see entry in “Metal-organic Compounds”, Chapter 5. [Abbott et al. Org Synth Coll Vol II 10 1943, Huntress et al. Org Synth Coll Vol IV 329 1963, Beilstein 2 H 801, 2 I 317, 2 II 670, 2 III 1991, 2 IV 2290.] |
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