Crotononitrile
Also known as: 2-Butenenitrile, 1-Propenyl cyanide, Crotonic nitrile, β-Methylacrylonitrile, 1-Cyanopropene, Crotononitrile (pract), NSC 165574, But-2-enenitrile
Crotononitrile (CAS 4786-20-3) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C4H5N and a molecular weight of 67.089 g/mol. Key properties include a melting point of -51.5ºC, a boiling point of 120.5±0.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 20.0±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H302 — Harmful if swallowed and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 4786-20-3
- Jingsj CID
- J-1359075-0
- Molecular Formula
- C4H5N
- Molecular Weight
- 67.089 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -51.5ºC |
|---|---|
| Boiling Point | 120.5±0.0 °C at 760 mmHg |
| Density | 0.8±0.1 g/cm3 |
| Flash Point | 20.0±0.0 °C |
| Exact Mass | 67.042198 |
| PSA | 23.79000 |
| LogP | 0.71 |
| Vapor Pressure | 15.2±0.2 mmHg at 25°C |
| Refractive Index | 1.418 |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Frequently Asked Questions
What is the CAS number of Crotononitrile?
The CAS number of Crotononitrile is 4786-20-3.
What are the molecular formula and molecular weight of Crotononitrile?
Crotononitrile has molecular formula C4H5N and molecular weight 67.089 g/mol.
Is Crotononitrile hazardous?
Crotononitrile has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H302 — Harmful if swallowed; H315 — Causes skin irritation.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Crotononitrile (CAS 4786-20-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1359075-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.