1-Chloro-4-ethynylbenzene
Also known as: 4-Chlorophenylacetylene, 4-Ethynyl-1-chlorobenzene, (4-Chlorophenyl)ethyne, (p-Chlorophenyl)acetylene, p-Ethynylchlorobenzene, 1-Chloro-4-ethynylbenzene
1-Chloro-4-ethynylbenzene (CAS 873-73-4) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C8H5Cl and a molecular weight of 136.578 g/mol. Key properties include a melting point of 45-47 °C(lit.), a boiling point of 178.5±23.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 57.3±18.0 °C. It is classified under GHS with signal word Danger and hazard statements H228, 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.
- 873-73-4
- Jingsj CID
- J-44477-9
- Molecular Formula
- C8H5Cl
- Molecular Weight
- 136.578 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 45-47 °C(lit.) |
|---|---|
| Boiling Point | 178.5±23.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 57.3±18.0 °C |
| Exact Mass | 136.007980 |
| LogP | 2.99 |
| Vapor Pressure | 1.3±0.3 mmHg at 25°C |
| Refractive Index | 1.564 |
GHS Safety & Compliance
- H228
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2903999090 |
|---|---|
| Summary | 2903999090 halogenated derivatives of aromatic hydrocarbons VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:5.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 1-Chloro-4-ethynylbenzene?
The CAS number of 1-Chloro-4-ethynylbenzene is 873-73-4.
What are the molecular formula and molecular weight of 1-Chloro-4-ethynylbenzene?
1-Chloro-4-ethynylbenzene has molecular formula C8H5Cl and molecular weight 136.578 g/mol.
Is 1-Chloro-4-ethynylbenzene hazardous?
1-Chloro-4-ethynylbenzene has GHS signal word Danger and hazard statements H228; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 1-Chloro-4-ethynylbenzene?
For 1-Chloro-4-ethynylbenzene, Upstream Products: (4-Chlorophenylethynyl)trimethylsilane, 1-Chloro-4-iodobenzene, Propiolic acid; Downstream Products: 2-(4-Chlorobenzyl)-1H-benzimidazole, 3-(4-Chlorophenyl)-2-propyn-1-ol, 2-(4-Chlorophenyl)-2-oxoethyl acetate.
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-Chloro-4-ethynylbenzene (CAS 873-73-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44477-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.