4-Bromo-2-methyl-1-butene
4-溴-2-甲基-1-丁烯
Also known as: 1-Bromo-3-methyl-3-butene, 1-Butene, 4-bromo-2-methyl-, 2-Methyl-4-bromo-1-butene, 3-Methyl-3-butenyl bromide, 4-Bromo-2-methyl-but-1-ene, 4-bromo-2-methyl-butene
4-Bromo-2-methyl-1-butene (CAS 20038-12-4) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H9Br and a molecular weight of 149.029 g/mol. It is also known as 1-Bromo-3-methyl-3-butene, 1-Butene, 4-bromo-2-methyl- and 2-Methyl-4-bromo-1-butene. Key properties include a boiling point of 125.2±9.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 25.9±10.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 20038-12-4
- Jingsj CID
- J-1085086-8
- Molecular Formula
- C5H9Br
- Chinese Name
- 4-溴-2-甲基-1-丁烯
- Molecular Weight
- 149.029 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 125.2±9.0 °C at 760 mmHg |
|---|---|
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 25.9±10.2 °C |
Frequently Asked Questions
What is the CAS number of 4-Bromo-2-methyl-1-butene?
The CAS number of 4-Bromo-2-methyl-1-butene is 20038-12-4.
What are the molecular formula and molecular weight of 4-Bromo-2-methyl-1-butene?
4-Bromo-2-methyl-1-butene has molecular formula C5H9Br and molecular weight 149.029 g/mol.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Bromo-2-methyl-1-butene (CAS 20038-12-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1085086-8 (accessed 2026-10-22).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.