Acetylenedicarboxylic acid
Also known as: but-2-ynedioic acid, 2-butynedioic acid, butynedioic acid, acetylenedicarboxylate
Acetylenedicarboxylic acid (CAS 142-45-0) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H2O4 and a molecular weight of 114.056 g/mol. Key properties include a melting point of 180-187 °C (dec.)(lit.), a boiling point of 362.4±25.0 °C at 760 mmHg, a density of 1.7±0.1 g/cm3 and a flash point of 187.2±19.7 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 142-45-0
- Jingsj CID
- J-1148204-5
- Molecular Formula
- C4H2O4
- Molecular Weight
- 114.056 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 180-187 °C (dec.)(lit.) |
|---|---|
| Boiling Point | 362.4±25.0 °C at 760 mmHg |
| Density | 1.7±0.1 g/cm3 |
| Flash Point | 187.2±19.7 °C |
| Exact Mass | 113.995308 |
| PSA | 74.60000 |
| LogP | 0.34 |
| Vapor Pressure | 0.0±1.7 mmHg at 25°C |
| Refractive Index | 1.560 |
| Storage Conditions | 2-8°C |
| Additional Property | soluble |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2917190090 |
|---|---|
| Summary | 2917190090 acyclic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Acetylenedicarboxylic acid?
The CAS number of Acetylenedicarboxylic acid is 142-45-0.
What are the molecular formula and molecular weight of Acetylenedicarboxylic acid?
Acetylenedicarboxylic acid has molecular formula C4H2O4 and molecular weight 114.056 g/mol.
Is Acetylenedicarboxylic acid hazardous?
Acetylenedicarboxylic acid has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of Acetylenedicarboxylic acid?
For Acetylenedicarboxylic acid, Upstream Products: 2-Butyne-1,4-diol, n-Butyllithium, Vinyl bromide; Downstream Products: diethyl (2Z)-2-chloro-2-butenedioate, Oxaloacetic acid, 1H-1,2,3-triazole-4,5-dicarboxylic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Acetylenedicarboxylic acid (CAS 142-45-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1148204-5 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.