Chemistry:2-Methyl-2-butene

2-Methyl-2-butene

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
PubChem CID	10553
UNII	HR68LQ4T3X Y
UN number	2460
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
Main hazards	Mildly toxic
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).
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Infobox references

Tracking categories (test):

• SizeSet

2-Methyl-2-butene, 2m2b, 2-methylbut-2-ene, also beta-isoamylene is an alkene hydrocarbon with the molecular formula C₅H₁₀.

Used as a free radical scavenger in trichloromethane (chloroform) and dichloromethane (methylene chloride). 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, but stopped using it for unknown reasons.

See also

• Pentene