3-Methyl-2-butenoic acid
Also known as: 3,3-Dimethylacrylic acid, 3-Methylcrotonic acid, Senecioic acid, β-Methylcrotonic acid, 3-Methylbut-2-enoic acid, 2-Butenoic acid, 3-methyl-, (CH3)2C=CHCOOH, MFCD00004366, EINECS 208-782-7
3-Methyl-2-butenoic acid (CAS 541-47-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H8O2 and a molecular weight of 100.116 g/mol. Key properties include a melting point of 65-70 °C(lit.), a boiling point of 194.5±0.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 95.9±9.6 °C. It is classified under GHS with signal word Danger and hazard statements H315 — Causes skin irritation, H318 — Causes serious eye damage and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 541-47-9
- Jingsj CID
- J-15085-6
- Molecular Formula
- C5H8O2
- Molecular Weight
- 100.116 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 65-70 °C(lit.) |
|---|---|
| Boiling Point | 194.5±0.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 95.9±9.6 °C |
| Exact Mass | 100.052429 |
| PSA | 37.30000 |
| LogP | 1.35 |
| Vapor Pressure | 0.2±0.7 mmHg at 25°C |
| Refractive Index | 1.451 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2916190090 |
|---|---|
| Summary | 2916190090 unsaturated acyclic monocarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives。supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward)。VAT:17.0%。tax rebate rate:9.0%。MFN tariff:6.5%。general tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 3-Methyl-2-butenoic acid?
The CAS number of 3-Methyl-2-butenoic acid is 541-47-9.
What are the molecular formula and molecular weight of 3-Methyl-2-butenoic acid?
3-Methyl-2-butenoic acid has molecular formula C5H8O2 and molecular weight 100.116 g/mol.
Is 3-Methyl-2-butenoic acid hazardous?
3-Methyl-2-butenoic acid has GHS signal word Danger and hazard statements H315 — Causes skin irritation; H318 — Causes serious eye damage; H335 — May cause respiratory irritation.
What are the upstream and downstream products of 3-Methyl-2-butenoic acid?
For 3-Methyl-2-butenoic acid, Upstream Products: 3-Methyl-2-buten-1-ol, 1-bromo-2-methylprop-1-ene, Mesityl oxide; Downstream Products: 3,3-Dimethylacryloyl chloride, 3-Fluoro-DL-valine, Isophorone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Methyl-2-butenoic acid (CAS 541-47-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15085-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.