1,4-Dichloro-2-butyne
Also known as: 1,4-dichlorobut-2-yne, 2-Butyne, 1,4-dichloro-, bis(chloromethyl)acetylene, 1,4-Dichlorobutyne, NSC 30603, MFCD00000981, EINECS 212-474-8, G2UU2G
1,4-Dichloro-2-butyne (CAS 821-10-3) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C4H4Cl2 and a molecular weight of 122.981 g/mol. Key properties include a melting point of -34.5ºC, a boiling point of 165.5±0.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 70.7±13.9 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 821-10-3
- Jingsj CID
- J-12205-0
- Molecular Formula
- C4H4Cl2
- Molecular Weight
- 122.981 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -34.5ºC |
|---|---|
| Boiling Point | 165.5±0.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 70.7±13.9 °C |
| Exact Mass | 121.969009 |
| LogP | 2.01 |
| Vapor Pressure | 2.5±0.3 mmHg at 25°C |
| Refractive Index | 1.474 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2903299090 |
|---|---|
| Summary | 2903299090 other unsaturated chlorinated derivatives of acyclic hydrocarbons。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 1,4-Dichloro-2-butyne?
The CAS number of 1,4-Dichloro-2-butyne is 821-10-3.
What are the molecular formula and molecular weight of 1,4-Dichloro-2-butyne?
1,4-Dichloro-2-butyne has molecular formula C4H4Cl2 and molecular weight 122.981 g/mol.
Is 1,4-Dichloro-2-butyne hazardous?
1,4-Dichloro-2-butyne has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of 1,4-Dichloro-2-butyne?
For 1,4-Dichloro-2-butyne, Upstream Products: 2-Butyne-1,4-diol, Pyridine, Thionyl chloride; Downstream Products: 1,4-Bis(dimethylamino)-2-butyne, 5-Methyl-1H-pyrrole-2-carboxylic acid, Ethyl 5-methyl-1H-pyrrole-2-carboxylate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1,4-Dichloro-2-butyne (CAS 821-10-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-12205-0 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.