2-Methyl-2-butene

2-Methyl-2-butene, 2m2b, 2-methylbut-2-ene, beta-isoamylene, or trimethylethylene is an alkene hydrocarbon with the molecular formula C₅H₁₀. It is a flammable liquid.

Quick facts Names, Identifiers ...

2-Methyl-2-butene^[1][2][3]

Names
Preferred IUPAC name 2-Methylbut-2-ene
Other names β-Isoamylene Trimethylethylene 2-Methyl-2-butene Isoamylene
Identifiers
CAS Number	513-35-9 Y
3D model (JSmol)	Interactive image
ChemSpider	10113 Y
ECHA InfoCard	100.007.416
PubChem CID	10553
UNII	HR68LQ4T3X Y
UN number	2460
CompTox Dashboard (EPA)	DTXSID8027165
InChI InChI=1S/C5H10/c1-4-5(2)3/h4H,1-3H3 Y Key: BKOOMYPCSUNDGP-UHFFFAOYSA-N Y InChI=1/C5H10/c1-4-5(2)3/h4H,1-3H3 Key: BKOOMYPCSUNDGP-UHFFFAOYAE
SMILES C(=C(\C)C)\C
Properties
Chemical formula	C5H10
Molar mass	70.1329 g/mol
Appearance	Colorless liquid
Odor	Sweet
Density	0.662 g/cm3
Melting point	−134 °C (−209 °F; 139 K)
Boiling point	39 °C (102 °F; 312 K)
Solubility in water	Slightly soluble
Solubility in alcohols, ether	Miscible
Magnetic susceptibility (χ)	−54.14·10−6 cm3/mol
Refractive index (nD)	1.385
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Mildly toxic, flammable
Flash point	< −45 °C (−49 °F; 228 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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Used as a free radical scavenger in trichloromethane and dichloromethane. It is also used to scavenge hypochlorous acid (HOCl) in the Pinnick oxidation.

John Snow, the English physician, experimented with it in the 1840s as an anesthetic.^[4]