4-Bromo-2-methyl-1-butene

Modify Date: 2025-08-25 21:11:04

4-Bromo-2-methyl-1-butene Structure
4-Bromo-2-methyl-1-butene structure
 Common Name 4-Bromo-2-methyl-1-butene
CAS Number 20038-12-4 Molecular Weight 149.029
Density 1.3±0.1 g/cm3 Boiling Point 125.2±9.0 °C at 760 mmHg
Molecular Formula C5H9Br Melting Point N/A
MSDS N/A Flash Point 25.9±10.2 °C

 Names

Name 4-bromo-2-methylbut-1-ene
Synonym More Synonyms

 Chemical & Physical Properties

Density 1.3±0.1 g/cm3
Boiling Point 125.2±9.0 °C at 760 mmHg
Molecular Formula C5H9Br
Molecular Weight 149.029
Flash Point 25.9±10.2 °C
Exact Mass 147.988754
LogP 2.89
Vapour Pressure 14.9±0.2 mmHg at 25°C
Index of Refraction 1.458

 Safety Information

Hazard Codes F+
HS Code 2903399090

 Synthetic Route

methanesulfonic acid,3-methylbut-3-en-1-ol structure

methanesulfonic...

CAS#:80352-66-5

~98%

4-Bromo-2-methyl-1-butene Structure

4-Bromo-2-methy...

CAS#:20038-12-4

Literature: Montero, Jean-Louis; Zgani, Ibrahim; Menut, Chantal; Gallois, Valerie Patent: US2006/241087 A1, 2006 ; Location in patent: Page/Page column 26-27 ;
ISOPRENOL structure

ISOPRENOL

CAS#:763-32-6

~74%

4-Bromo-2-methyl-1-butene Structure

4-Bromo-2-methy...

CAS#:20038-12-4

Literature: Berkowitz, William F.; Wu, Yanzhong Journal of Organic Chemistry, 1997 , vol. 62, # 5 p. 1536 - 1539
3-Buten-1-ol,3-methyl-, 1-(4-methylbenzenesulfonate) structure

3-Buten-1-ol,3-...

CAS#:781-03-3

~78%

4-Bromo-2-methyl-1-butene Structure

4-Bromo-2-methy...

CAS#:20038-12-4

Literature: Braddock, D. Christopher; Brown, John M. Collection of Czechoslovak Chemical Communications, 2000 , vol. 65, # 5 p. 741 - 756
(E)-7-bromo-5-methylhepta-1,4-diene structure

(E)-7-bromo-5-m...

CAS#:1246996-36-0

~%

4-Bromo-2-methyl-1-butene Structure

4-Bromo-2-methy...

CAS#:20038-12-4

N/A structure

N/A

CAS#:1165952-92-0

Literature: Journal of Organic Chemistry, , vol. 75, # 20 p. 6908 - 6922

 Customs

HS Code 2903399090
Summary 2903399090. brominated,fluorinated or iodinated derivatives of acyclic hydrocarbons. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:5.5%. General tariff:30.0%

 Synonyms

4-Bromo-2-methyl-1-butene
2-Methyl-4-bromo-1-butene
4-bromo-2-methyl-butene
1-bromo-3-methylbut-3-ene
1-Butene, 4-bromo-2-methyl-
1-Butene,4-bromo-2-methyl
4-BROMO-2-METHYL-BUT-1-ENE
1-Bromo-3-methyl-3-butene
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