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Halogenated compounds

2-Bromobutane

Also known as sec-Butyl bromide, Butane, 2-bromo-, 2-Butyl bromide

CAS 78-76-2Formula C4H9BrMolar mass 137.02 g/molEC 201-140-7
GHS signal word: Danger. Pictograms: Flammable 22 suppliers listed
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2-Bromobutane chemical structure, C4H9Br, CAS 78-76-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Clear, colorless liquid
Melting point
-112 °C
Boiling point
91.2 °C
Density
1.2425 at 25 °C/25 °C
Flash point
21.1 °C
HS code
290369
Category
Halogenated compounds
UN number
UN 2339
Illustrative photo, clear colourless liquid in a glass reagent bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is 2-Bromobutane?

Plain description, key identifiers and synonyms

2-bromobutane appears as a colorless to pale-yellow colored liquid with a pleasant odor. Flash point 65 °F. Insoluble in water and denser than water. Vapors are heavier than air and may be narcotic in high concentrations. Used to make other chemicals.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-bromobutane
CAS number
78-76-2 CAS number cross-checked
EC number
201-140-7
Molecular formula
C4H9Br
UNII
SSI829JO4W
MDL number
MFCD00000156
InChIKey
UPSXAPQYNGXVBF-UHFFFAOYSA-N
InChI
InChI=1S/C4H9Br/c1-3-4(2)5/h4H,3H2,1-2H3
SMILES (canonical and isomeric)
CCC(C)Br

Synonyms

  • sec-Butyl bromide
  • Butane, 2-bromo-
  • 2-Butyl bromide
  • Methylethylbromomethane
  • Secondary butyl bromide
  • (+-)-2-Bromobutane
  • 1-Bromo-1-methylpropane
  • 2-Bromo-butane
  • sec-Butylbromide
  • 3-bromobutane
  • 2-brombutane
  • 2-Bromo butane
  • sec. butyl bromide
  • sec.-butyl bromide
  • sec-C4H9Br
  • 1-Methylpropyl bromide
  • 2-Bromobutane, 98%
  • (.+/-.)-2-Bromobutane
  • 0-01-00-00119 (Beilstein Handbook Reference)
  • 2-bromobutane, Butane, 2-bromo
  • 2-Bromobutane, (+/-)-
  • sec-Butyl bromide, (+/-)-
  • UN 2339
  • sec-Butyl bromide DL-form
  • Methylethylbromoomethane, sec-Butyl bromide
Show all 27 synonyms
  • 2-Bromobutane, purum, >=98.0% (GC)
  • 2-Bromobutane [UN2339] [Flammable liquid]

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Clear, colorless liquidexp.
Odour
Pleasant odorexp.
Melting point
-112 °Cexp.
Boiling point
91.2 °Cexp.
Density
1.2425 at 25 °C/25 °Cexp.
Flash point
21.1 °Cexp.
Solubility
Soluble in alcohol and ether, insoluble in water.exp.
Vapour pressure
57 mm Hg at 25 °C (extrapolated)exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
137.02 g/molcalc.
Exact mass
135.9888 Dacalc.
LogP (octanol/water)
2.18calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
1calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (12)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2339
Transport hazard class
3
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

2-Bromobutane suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 22 suppliers
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Where suppliers are based

22 suppliers in 6 countries

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2-Bromobutane price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Synthesis, alkylating agent.

How it is made

The reaction of hydrogen bromide with 1-butene under ionic conditions and in the absence of a peroxides.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 2-Bromobutane is traded under.

HS 2903.69Indicative HS code

Brominated or iodinated derivatives of acyclic hydrocarbons, other

World exports in 2024
$135M
−18.6% vs 2023, imports $139M
2022 to 2024
Top exporters
  1. China26.7%
  2. United States26.3%
  3. Netherlands12.3%
Top importers
  1. United States13.2%
  2. India * partner reported9.6%
  3. Japan9.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for 2-Bromobutane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2-Bromobutane, based on the data on this page

What is 2-Bromobutane?

2-bromobutane appears as a colorless to pale-yellow colored liquid with a pleasant odor. Flash point 65 °F. Insoluble in water and denser than water. Vapors are heavier than air and may be narcotic in high concentrations. Used to make other chemicals.

What is the CAS number of 2-Bromobutane?

The CAS registry number of 2-Bromobutane is 78-76-2.

What is the molecular formula and weight of 2-Bromobutane?

The molecular formula of 2-Bromobutane is C4H9Br and its molar mass is 137.02 g/mol.

What is 2-Bromobutane used for?

Synthesis, alkylating agent.

Is 2-Bromobutane hazardous?

2-Bromobutane carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, harmful to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Bromobutane?

2-Bromobutane is usually classified under HS code 290369 (Brominated or iodinated derivatives of acyclic hydrocarbons, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 2-Bromobutane?

CompoundList lists 22 suppliers of 2-Bromobutane in China, India, Germany, France and 2 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy 2-Bromobutane in India?

7 suppliers in India list 2-Bromobutane on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of 2-Bromobutane?

Suppliers quote 2-Bromobutane on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle 2-Bromobutane

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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