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3-Methyl-1-butene structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

3-Methyl-1-butene Properties

Melting point:
-168 °C
Boiling point:
20 °C(lit.)
0.627 g/mL at 20 °C(lit.)
vapor pressure 
14.97 psi ( 20 °C)
refractive index 
n20/D 1.364
Flash point:
-57 °C
storage temp. 
Soluble in alcohol, benzene, and ether (Weast, 1986)
>14 (Schwarzenbach et al., 1993)
Water Solubility 
130 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1966)
Henry's Law Constant
(atm?m3/mol): 0.535 at 25 °C (Hine and Mookerjee, 1975)
CAS DataBase Reference
563-45-1(CAS DataBase Reference)
NIST Chemistry Reference
1-Butene, 3-methyl-(563-45-1)
EPA Substance Registry System
1-Butene, 3-methyl-(563-45-1)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
Hazard Codes  F+,Xn
Risk Statements  12-36/37/38-65
Safety Statements  16-26-62
RIDADR  UN 2561 3/PG 1
WGK Germany  3
HazardClass  3.1
PackingGroup  I
Hazardous Substances Data 563-45-1(Hazardous Substances Data)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H224 Extremely flammable liquid and vapour Flammable liquids Category 1 Danger
H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P331 Do NOT induce vomiting.
P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

NFPA 704

Diamond Hazard Value Description
2 0
Health   2 Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g. diethyl ether, ammonium phosphate, iodine)
Flammability   4 Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Includes pyrophoric substances. Flash point below room temperature at 22.8 °C (73 °F). (e.g. acetylene, propane, hydrogen gas)
Instability   0 Normally stable, even under fire exposure conditions, and is not reactive with water (e.g. helium,N2)

(NFPA, 2010)

3-Methyl-1-butene price More Price(9)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 257931 3-Methyl-1-butene 95% 563-45-1 100g $180 2018-11-13 Buy
Sigma-Aldrich 257931 3-Methyl-1-butene 95% 563-45-1 400g $442 2018-11-13 Buy
TCI Chemical M0177 3-Methyl-1-butene (in cylinder without valve) [To use this product charged in cylinder, a valve is required which is sold separately (Product Code:V0030)] >95.0%(GC) 563-45-1 100g $205 2018-11-22 Buy
TCI Chemical M2563 3-Methyl-1-butene (ca. 15% in Dichloromethane, ca. 2.5mol/L) 563-45-1 100mL $73 2018-11-22 Buy
TCI Chemical M2564 3-Methyl-1-butene (ca. 16.5% in N,N-Dimethylformamide, ca. 2mol/L) 563-45-1 100mL $88 2018-11-22 Buy

3-Methyl-1-butene Chemical Properties,Uses,Production

Chemical Properties

Colorless, extremely volatile liquid or gas; disagreeable odor.Soluble in alcohol; insoluble in water.

Physical properties

Colorless, flammable liquid or gas with a disagreeable odor


Organic synthesis, high-octane fuel manufacture.


ChEBI: An alkene that is but-1-ene carrying a methyl substituent at position 3.

General Description

A colorless volatile liquid with a disagreeable odor. Insoluble in water and less dense than water. Vapors heavier than air. Flash point below 0°F. Used to make other chemicals.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

3-Methyl-1-butene may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic addition polymerization reactions.


Highly flammable, dangerous fire and explosion risk, explosive limits 1.6–9.1%.

Health Hazard

Inhalation or contact with material may irritate or burn skin and eyes. Fire may produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Safety Profile

Very dangerous fire hazard when exposed to heat, flame, or oxidizers. Explosive in the form of vapor when exposed to heat or flame. To fight fire, use alcohol foam, mist, spray, dry chemical, CO2. When heated to decomposition it emits acrid smoke and irritating fumes. See also 2-METHYL-1 BUTENE.


Schauer et al. (1999) reported 3-methyl-1-butene in a diesel-powered medium-duty truck exhaust at an emission rate of 160 μg/km.
Schauer et al. (2001) measured organic compound emission rates for volatile organic compounds, gas-phase semi-volatile organic compounds, and particle-phase organic compounds from the residential (fireplace) combustion of pine, oak, and eucalyptus. The gas-phase emission rate of 3-methyl-1-butene was 6.9 mg/kg of pine burned. Emission rates of 3-methyl-1-butene were not measured during the combustion of oak and eucalyptus.
California Phase II reformulated gasoline contained 3-methyl-1-butene at a concentration of 380 mg/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 0.35 and 22.5 mg/km, respectively (Schauer et al., 2002).

Environmental Fate

Photolytic. The following rate constants were reported for the reaction of 3-methyl-1-butene and OH radicals in the atmosphere: 3.0 x 10-11 cm3/molecule?sec (Atkinson et al., 1979); 6.07 to 9.01 x 10-11 cm3/molecule?sec (Atkinson, 1985); 3.18 x 10-11 cm3/molecule?sec (Atkinson, 1990).
Chemical/Physical. Complete combustion in air yields carbon dioxide and water.

3-Methyl-1-butene Preparation Products And Raw materials

Raw materials

Preparation Products

3-Methyl-1-butene Suppliers

Global( 61)Suppliers
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Mainchem Co., Ltd.
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Chemwill Asia Co.,Ltd.
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Hubei xin bonus chemical co. LTD
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J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
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Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
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TCI (Shanghai) Development Co., Ltd. 021-67121386 / 800-988-0390
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Energy Chemical 021-58432009 / 400-005-6266
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Richest Group Limited +86 21 5017 5386/3175 7285/86/87/88/89
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Maya High Purity Chemicals +86 (573) 82222445 (0)18006601000 QQ:452520369
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Hangzhou Yuhao Chemical Technology Co., Ltd 0571-82693216
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