trans-2-Methyl-2-butenal
Also known as: Tiglic Aldehyde, 2-Methylcrotonaldehyde, (E)-2-Methyl-2-butenal, (E)-2-methylbut-2-enal, trans-2-Methyl-but-2-enal
trans-2-Methyl-2-butenal (CAS 497-03-0) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H8O and a molecular weight of 84.11640 g/mol. Key properties include a boiling point of 116-119 °C752 mm Hg(lit.), a density of 0.871 g/mL at 25 °C(lit.) and a flash point of 18.3 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 497-03-0
- Jingsj CID
- J-45248-3
- Molecular Formula
- C5H8O
- Molecular Weight
- 84.11640 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 116-119 °C752 mm Hg(lit.) |
|---|---|
| Density | 0.871 g/mL at 25 °C(lit.) |
| Flash Point | 18.3 °C |
| Exact Mass | 84.05750 |
| PSA | 17.07000 |
| LogP | 1.15150 |
| Refractive Index | n20/D 1.448(lit.) |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Frequently Asked Questions
What is the CAS number of trans-2-Methyl-2-butenal?
The CAS number of trans-2-Methyl-2-butenal is 497-03-0.
What are the molecular formula and molecular weight of trans-2-Methyl-2-butenal?
trans-2-Methyl-2-butenal has molecular formula C5H8O and molecular weight 84.11640 g/mol.
Is trans-2-Methyl-2-butenal hazardous?
trans-2-Methyl-2-butenal has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of trans-2-Methyl-2-butenal?
For trans-2-Methyl-2-butenal, Upstream Products: Tiglic acid, But-2-yne, (E)-2-Bromo-2-butene; Downstream Products: 2,3,4,5-Tetramethyl-2-cyclopenten-1-one, Pentamethylcyclopentadiene, Diethyl carbonate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "trans-2-Methyl-2-butenal (CAS 497-03-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-45248-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.