2-methylbutene

Description

2-methylbutene · CAS 26760-64-5 · C5H10. UNII 33C9Y0I55H. Boiling Point: 31.2 °C; Boiling Point: 31.04 °C @760 [mm Hg]; Melting Point: -137.5 °C.

Identification

CAS Registry Number	26760-64-5
PubChem CID	11240
Molecular formula	C5H10
IUPAC name	2-methylbut-1-ene
UNII (FDA)	33C9Y0I55H

Computed Descriptors

Molecular Weight	70.13
XLogP3	2.5
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	1
Exact Mass	70.078250319
Monoisotopic Mass	70.078250319
Topological Polar Surface Area	0
Heavy Atom Count	5
Formal Charge	0

Physical & Chemical Properties

Boiling Point	31.2 °C
Boiling Point	31.04 °C @760 [mm Hg]
Melting Point	-137.5 °C
Flash Point	less than 20 °F (NFPA, 2010)
Flash Point	Flash point < -7 °C
Solubility	In water, 130 mg/l @ 20 °C.
Density	0.6504 @ 20 °C/4 °C
Density	0.06504 @ 20°C
Vapor Pressure	610.0 [mmHg]
Vapor Pressure	610 mm Hg @ 25 °C

Physical description & handling notes

• Isopentenes appears as a colorless liquid with a pleasant odor. A mixture of isomers. Insoluble in water and less dense than water. Hence floats on water. Vapors are heavier than air. Used as a solvent and to make other chemicals.
• 2-methyl-1-butene appears as a colorless volatile liquid with a disagreeable odor. Insoluble in water and less dense than water. Vapors are heavier than air. Used to make other chemicals.
• Liquid
• Liquid; Gas Vapor
• Colorless volatile liquid with a disagreeable odor; [Hawley] Colorless liquid; bp = 31-32 deg C; [MSDSonline]
• Colorless liquid

GHS Hazard Classification

Reported hazard statements	H224 (79%), H225 (21%), H302 (100%), H304 (81.9%), H315 (81.9%), H336 (81.9%), H341 (81.9%), H351 (81.9%)

Documented Uses

• CHEM INT FOR PETROLEUM RESINS (AS MIXED PENTENES)
• Pentenes are components of gasoline and are often produced as by-products of catalytic of thermal cracking of petroleum. (L1287)
• CATALYTIC CRACKING OR STEAM CRACKING OF PETROLEUM FOLLOWED BY ISOLATION OF C5 FRACTION AND EXTRACTION WITH COLD AQUEOUS SULFURIC ACID
• (1977) AT LEAST 4.54X10+9 GRAMS
• (1981) 7.43X10+10 G (TOTAL, MIXED PENTENES)
• All Other Basic Organic Chemical Manufacturing

Synonyms

2-METHYL-1-BUTENE; 2-Methylbut-1-ene; 1-Butene, 2-methyl-; UNII-33C9Y0I55H; 2-methyl-1-butylene; HSDB 5695; 33C9Y0I55H; EINECS 209-250-7; NSC 72414; NSC-72414; UN2459; 1-BUTENE,2-METHYL; DTXSID3052224; CHEBI:77915; 2-METHYLBUT-1-ENE [HSDB]; UN 2371

Frequently Asked Questions

What are the CAS number and molecular formula of 2-methylbutene?

CAS 26760-64-5; molecular formula C5H10; molecular weight — g/mol.

What other names is 2-methylbutene known by?

2-METHYL-1-BUTENE, 2-Methylbut-1-ene, 1-Butene, 2-methyl-, UNII-33C9Y0I55H, 2-methyl-1-butylene, HSDB 5695.

Is 2-methylbutene classified as hazardous?

Hazard statements reported: H224, H225, H302, H304, H315.

What are the key physical properties of 2-methylbutene?

Boiling Point: 31.2 °C; Boiling Point: 31.04 °C @760 [mm Hg]; Melting Point: -137.5 °C; Flash Point: less than 20 °F (NFPA, 2010).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.