295469

2-Methylpropene

99%

• Synonym(s): Isobutylene
• Linear Formula: (CH₃)₂C=CH₂
• CAS Number: 115-11-7
• Molecular Weight: 56.11
• Beilstein/REAXYS Number: 773645
• EC Number: 204-066-3
• MDL number: MFCD00008898
• UNSPSC Code: 12142100
• PubChem Substance ID: 24857786
• NACRES: NA.22

Properties

• vapor density: 2 (vs air)
• Quality Level: 100
• vapor pressure: 3278 mmHg ( 37.7 °C)
• assay: 99%
• autoignition temp.: 869 °F
• bp: −6.9 °C (lit.)
• mp: −140 °C
• SMILES string: CC(C)=C
• InChI: 1S/C4H8/c1-4(2)3/h1H2,2-3H3
• InChI key: VQTUBCCKSQIDNK-UHFFFAOYSA-N

Description

General description

2-methylpropene is used to synthesize S-(+)-2,2-Dimethylcyclopropane carboxylic acid via asymmetric cyclopropanation reaction.

Application

2-Methylpropene can be used in the following reactions:

• Asymmetric synthesis of S-(+)-2,2-dimethylcyclopropane carboxylic acid, a key building block for the synthesis of cilastatin.
• Alkylation of p-xylene to form t-butyl-p-xylene catalyzed by a heteropolyacid.
• Synthesis of poly(2-methylpropene) or polyisobutene.

Packaging

Supplied in a Sure/Pac^™ cylinder and has a brass needle valve with a male 1/4" NPTF outlet thread installed. Before using the cylinder, ensure that the valve is closed, then remove the galvanized steel hex cap that seals the outlet valve.

Compatible with the following:

• Aldrich^® Sure/Pac^™ station for liquefied gases Z566446
• PTFE Sealing tape Z104388 or Z221880
• Brass hose adapter Z146811
• Aldrich^® mini gas regulator Z513539

Legal Information

Aldrich is a registered trademark of Sigma-Aldrich Co. LLC

Sure/Pac is a trademark of Sigma-Aldrich Co. LLC

Safety Information

• pictograms: GHS02,GHS04
• signalword: Danger
• hcodes: H220,H280
• pcodes: P210 - P410 + P403
• Hazard Classifications: Flam. Gas 1 - Press. Gas Liquefied gas
• Storage Class: 2A - Gases
• wgk_germany: nwg
• flash_point_f: -112.0 °F - closed cup
• flash_point_c: -80 °C - closed cup
• ppe: Eyeshields, Faceshields, Gloves