ChemicalBook >> CAS DataBase List >>Acetylenedicarboxylic acid
Acetylenedicarboxylic acid
- CAS No.
- 142-45-0
- Chemical Name:
- Acetylenedicarboxylic acid
- Synonyms
- But-2-ynedioic acid;2-BUTYNEDIOIC ACID;2-Butynedioate;NSC-1903;NSC-631597;Butyne acid;butynedioicaci;BUTYNEDIOIC ACID;Acetylen-dicarbonsαure;2-BUTYNE-1,4-DIOIC ACID
- CBNumber:
- CB0334392
- Molecular Formula:
- C4H2O4
- Molecular Weight:
- 114.06
- MDL Number:
- MFCD00004362
- MOL File:
- 142-45-0.mol
- MSDS File:
- SDS
- TDS File:
- TDS
Last updated:2026-05-27 17:37:18
| Melting point | 180-187 °C (dec.) (lit.) |
|---|---|
| Boiling point | 133.5°C (rough estimate) |
| Density | 1.1794 (rough estimate) |
| bulk density | 550kg/m3 |
| 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 |
| InChI | 1S/C4H2O4/c5-3(6)1-2-4(7)8/h(H,5,6)(H,7,8) |
| InChIKey | YTIVTFGABIZHHX-UHFFFAOYSA-N |
| SMILES | OC(=O)C#CC(O)=O |
| 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) |
| UNSPSC Code | 12352106 |
| NACRES | NA.22 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS06 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H301-H315-H319-H335 | |||||||||
| Precautionary statements | P261-P264-P270-P301+P310-P302+P352-P305+P351+P338 | |||||||||
| target organs | Respiratory system | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges | |||||||||
| 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 | TSCA listed | |||||||||
| HazardClass | 6.1 | |||||||||
| PackingGroup | II | |||||||||
| HS Code | 29171990 | |||||||||
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
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| Hazard Classifications | Acute Tox. 3 Oral Eye Irrit. 2 Skin Irrit. 2 STOT SE 3 |
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| NFPA 704 |
|
Acetylenedicarboxylic acid price More Price(50)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | A15207 | Acetylenedicarboxylic acid 95% | 142-45-0 | 5g | $83.3 | 2026-04-30 | Buy |
| Sigma-Aldrich | A15207 | Acetylenedicarboxylic acid 95% | 142-45-0 | 25g | $237 | 2026-04-30 | Buy |
| TCI Chemical | A0088 | Acetylenedicarboxylic Acid >90.0%(HPLC) | 142-45-0 | 5g | $24 | 2026-04-30 | Buy |
| TCI Chemical | A0088 | Acetylenedicarboxylic Acid >90.0%(HPLC) | 142-45-0 | 25g | $96 | 2026-04-30 | Buy |
| Usbiological | 440882 | Acetylenedicarboxylic Acid | 142-45-0 | 5g | $312 | 2026-06-03 | Buy |
Acetylenedicarboxylic acid Chemical Properties, Uses, Production
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.]
Acetylenedicarboxylic acid Preparation Products And Raw materials
Raw materials
1of3
Preparation Products
1of2
Global Suppliers ( 297)
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Jinan Daen Pharmaceutical Technology Co., Ltd | 0531-68657833 15905416458 | 2098511197@qq.com | China | 283 | 58 |
| Jinan Daen Pharma Tech Co., Ltd. | 0531-15905416-458 15905416458 | 2479528971@qq.com | China | 307 | 58 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| INTATRADE GmbH | +49 3493/605464 | sales@intatrade.de | Germany | 3563 | 66 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 | 3bsc@sina.com | China | 15813 | 69 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
| Beijing HwrkChemical Technology Co., Ltd | 89508211 18501085097 | sales.bj@hwrkchemical.com | China | 9407 | 55 |
| Energy Chemical | 400-0056266 | sales8178@energy-chemical.com | China | 44850 | 61 |
View Latest Price from Acetylenedicarboxylic acid manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-09-16 | Acetaylenedicarboxylic Acid
142-45-0
|
$14.00-132.00 | 5g | 0.98 | 25kg | Shanghai UCHEM Inc. | |
 |
2026-03-20 | Acetylenedicarboxylic acid
142-45-0
|
$1.00 | 1kg | 99% | 10 mt | Hebei Chuanghai Biotechnology Co., Ltd | |
 |
2025-05-26 | Acetylenedicarboxylic acid
142-45-0
|
$3.00 | 1kg | 0.99 | 10000 | Hebei Fengjia New Material Co., Ltd |
-
- Acetaylenedicarboxylic Acid
142-45-0
- $14.00-132.00
- 0.98
- Shanghai UCHEM Inc.
-
- Acetylenedicarboxylic acid
142-45-0
- $1.00
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
-
- Acetylenedicarboxylic acid
142-45-0
- $3.00
- 0.99
- Hebei Fengjia New Material Co., Ltd
142-45-0 (Acetylenedicarboxylic acid) Related Search:
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NSC-631597
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ACETYLENEDICARBOXYLIC ACID FOR SYNTHESIS
Acetyleoledicarboxylicacid
BUTYNEDIOIC ACID
2-BUTYNE-1,4-DIOIC ACID
2-BUTYNEDIOIC ACID
ACETYLENEDICARBOXYLIC ACID
Acetaylenedicarboxylic Acid
Acetylenedicarboxylic Acid >
butynedioicaci
Acetylenedicarboxylic acid,142-45-0
2-Butyne-1,4-dioic acid,97% ,142-45-0
2-Butynedioate
But-2-ynedioic acid
142-45-0
HOOCCCCOOH
HO2CCCCO2H
HOOCC8801CCOOH
Acetylenes
Acetylenic Carboxylic Acids & Their Derivatives
Organic Building Blocks
Building Blocks
Carboxylic Acids
Carbonyl Compounds
C1 to C5
Aromatic Carboxylic Acids, Amides, Anilides, Anhydrides & Salts
Acetylenic Carboxylic Acids & Their Derivatives
Acetylenes
Pharmaceutical Intermediates
