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295469

Sigma-Aldrich

2-Methylpropene

99%

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Synonym(s):
Isobutylene
Linear Formula:
(CH3)2C=CH2
CAS Number:
Molecular Weight:
56.11
Beilstein:
773645
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.22

vapor density

2 (vs air)

Quality Level

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

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This Item
156582C56352295450
2-Methylpropene 99%

Sigma-Aldrich

295469

2-Methylpropene

2-Methylpropane 99%

Sigma-Aldrich

295450

2-Methylpropane

bp

−6.9 °C (lit.)

bp

90-92 °C (lit.)

bp

51-52 °C (lit.)

bp

−12 °C (lit.)

mp

−140 °C

mp

-

mp

−25 °C (lit.)

mp

−160 °C (lit.)

Quality Level

100

Quality Level

-

Quality Level

-

Quality Level

-

vapor density

2 (vs air)

vapor density

-

vapor density

3.2 (vs air)

vapor density

2.01 (21 °C, vs air)

vapor pressure

3278 mmHg ( 37.7 °C)

vapor pressure

-

vapor pressure

4.82 psi ( 20 °C)

vapor pressure

72.2 psi ( 37.7 °C)

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:

Legal Information

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

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Pictograms

FlameGas cylinder

Signal Word

Danger

Hazard Statements

Precautionary Statements

Hazard Classifications

Flam. Gas 1 - Press. Gas Liquefied gas

Storage Class Code

2A - Gases

WGK

nwg

Flash Point(F)

-112.0 °F - closed cup

Flash Point(C)

-80 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

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T1503
Product Number
-
25G
Pack Size/Quantity

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705578-5MG-PW

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MMYOMAG-74K-13

1000309185

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Molybdenum (III) Compounds as Catalysts for 2?Methylpropene Polymerization.
Hijazi A K, et al.
Angewandte Chemie (International Edition in English), 46(38), 7290-7292 (2007)
The synthesis of S-(+)-2, 2-dimethylcyclopropane carboxylic acid: a precursor for cilastatin
Wang Q, et al.
Tetrahedron Asymmetry, 9, 3971-3977 (1998)
Selective alkylation of p-xylene with 2-methylpropene by 12-tungstophosphoric acid.
Soeda H, et al.
Chemistry Letters (Jpn), 23(5), 909-912 (1994)
Jin-Zhou Zhu et al.
Biomaterials, 33(33), 8204-8212 (2012-08-18)
The presence of polymer coating on a coronary stent is a major mediator of coronary inflammation reaction thereby affects re-endothelialization. Poly(styrene-block-isobutylene-block-styrene) (SIBS) is one of the most attractive alternatives to serve as stent coating, but has shown less than optimal
Taichang Zhang et al.
The journal of physical chemistry. A, 112(42), 10495-10501 (2008-10-01)
The thermal decomposition pathways of MTBE have been investigated using the G3B3 method. On the basis of the experimental observation and theoretical calculation, the pyrolysis channels are provided, especially for primary pyrolysis reactions. The primary decomposition pathways include formation of

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