Crotonaldehyde
Also known as: (E)-2-Butenal, 2-Butenal, 2-Buten-1-al, Bu-2-tenal, But-2-en-1-al, Crotonal, t-2-Butenal, CH3CH=CHCHO, Topanel, Topanel CA, Crotonaldehyde, predominantly trans
Crotonaldehyde (CAS 123-73-9) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C4H6O and a molecular weight of 70.090 g/mol. Key properties include a melting point of −76 °C(lit.), a boiling point of 104.0±0.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 4.6±4.3 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 123-73-9
- Jingsj CID
- J-11687-0
- Molecular Formula
- C4H6O
- Molecular Weight
- 70.090 g/mol
- Category
- Organic Compounds
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | −76 °C(lit.) |
|---|---|
| Boiling Point | 104.0±0.0 °C at 760 mmHg |
| Density | 0.8±0.1 g/cm3 |
| Flash Point | 4.6±4.3 °C |
| Exact Mass | 70.041862 |
| PSA | 17.07000 |
| LogP | 0.51 |
| Additional Property | 2.41 (vs air) |
| Vapor Pressure | 31.4±0.1 mmHg at 25°C |
| Refractive Index | 1.402 |
| Additional Property | 150 g/L (20 ºC) |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H301 — Toxic if swallowed
- H311 — Toxic in contact with skin
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
- H330 — Fatal if inhaled
- H335 — May cause respiratory irritation
- H341 — Suspected of causing genetic defects
- H373 — May cause damage to organs through prolonged exposure
- H400 — Very toxic to aquatic life
Frequently Asked Questions
What is the CAS number of Crotonaldehyde?
The CAS number of Crotonaldehyde is 123-73-9.
What are the molecular formula and molecular weight of Crotonaldehyde?
Crotonaldehyde has molecular formula C4H6O and molecular weight 70.090 g/mol.
Is Crotonaldehyde hazardous?
Crotonaldehyde has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H311 — Toxic in contact with skin.
What are the upstream and downstream products of Crotonaldehyde?
For Crotonaldehyde, Upstream Products: Crotyl alcohol, 2-Vinyloxirane, Crotonoyl chloride; Downstream Products: 2-Butene, 1,1-diethoxy-, 2-Methyl-5-phenylpyridine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Crotonaldehyde (CAS 123-73-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-11687-0 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.