2-Methyl-2-butene CAS 513-35-9

Introduction：Basic information about 2-Methyl-2-butene CAS 513-35-9, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.

2-Methyl-2-butene Basic information

• Product Name: 2-Methyl-2-butene
• Synonyms: 2-METHYLBUTENE-2;N-AMYLENE;PENTENE;2-Mdethyl-2-butene;2-methyl-2-buten;2-Methylbut-2-ene;3-Methyl-2-butene;alpha,eta-amylene
• CAS: 513-35-9
• MF: C5H10
• MW: 70.13
• EINECS: 208-156-3
• Product Categories: Building Blocks;Chemical Synthesis;Organic Building Blocks;Acyclic;Alkenes;Organic Building Blocks
• Mol File: 513-35-9.mol

2-Methyl-2-butene Chemical Properties

• Melting point: -134 °C (lit.)
• Boiling point: 35-38 °C (lit.)
• density: 0.662 g/mL at 25 °C (lit.)
• vapor density: 2.4 (vs air)
• vapor pressure: 25.7 psi ( 55 °C)
• refractive index: n20/D 1.385(lit.)
• RTECS: EM7580000
• Fp: −4 °F
• storage temp.: 2-8°C
• solubility: Chloroform, Methanol (Slightly)
• form: Liquid
• color: Colorless
• explosive limit: 8.7%
• Water Solubility: Miscible with alcohol, benzene, ligroin, ethylene oxide and ether. Immiscible with water.
• Merck: 14,607
• BRN: 1361353
• Dielectric constant: 2.1（20℃）
• Stability: Volatile
• InChI: 1S/C5H10/c1-4-5(2)3/h4H,1-3H3
• InChIKey: BKOOMYPCSUNDGP-UHFFFAOYSA-N
• SMILES: C\C=C(\C)C
• LogP: 2.67
• CAS DataBase Reference: 513-35-9(CAS DataBase Reference)
• NIST Chemistry Reference: 2-Butene, 2-methyl-(513-35-9)
• EPA Substance Registry System: 2-Methyl-2-butene (513-35-9)

Safety Information

• Hazard Codes: F,Xn,N,F+
• Risk Statements: 11-22-65-51/53-12-36/37/38-19-68-67-38-52/53-40-36/37
• Safety Statements: 45-9-61-33-16-36/37/39-26-62-36/37
• RIDADR: UN 2460 3/PG 2
• WGK Germany: 3
• TSCA: TSCA listed
• HazardClass: 3
• PackingGroup: II
• HS Code: 29012900
• Storage Class: 3 - Flammable liquids
• Hazard Classifications: Acute Tox. 4 Oral Aquatic Chronic 2 Asp. Tox. 1 Flam. Liq. 1 Muta. 2 STOT SE 3
• Hazardous Substances Data: 513-35-9(Hazardous Substances Data)

2-Methyl-2-butene Usage And Synthesis

Description

2-Methyl-2-butene (also named as Amylene) is an alkene hydrocarbon with the molecular formula C5H10. It is a colorless to pale yellow clear liquid. It can be used as a free radical scavenger in trichloromethane and dichloromethane. It was used for the alkylation of 3-methylthiophene over a zeolitic catalyst. It was also used as a precursor of peroxyacetyl nitrate for calibration purpose.

Chemical Properties

2-Methyl-2-butene is a colorless volatile liquid with unpleasant odour (detection limit ca. 2 ppt) . soluble in alcohol, ether, benzene, insoluble in water. It is used in organic synthesis, hydrogenation, halogenation, alkylation, condensation reactions.

Uses

2-Methyl-2-butene is used to prepare 3-Brom-2.3-dimethyl-1.1-dicyan-butan in the presence of 2,2'-azobis-(2,4-dimethyl-4-methoxyvaleronitrile) as a catalyst. It may be employed as precursor for peroxyacetyl nitrate for the calibration purposes.

Definition

ChEBI: 2-Methyl-2-butene is an alkene that is ethylene in which three of the hydrogens are replaced by methyl groups.

Preparation

2-methyl-2-butene is prepared by dehydration of tert-amyl alcohol in presence of p-toluenesulfonic acid or distillation of a catalytically cracked gasoline stream, followed by extraction with aqueous sulfuric acid at low temp.

General Description

2-methyl-2-butene appears as a clear colorless liquid with a petroleum-like odor. Less dense than water and insoluble in water. Hence floats on water. Vapors heavier than air.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

2-Methyl-2-butene may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release gaseous hydrogen. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic polymerization reactions.

Hazard

Highly flammable, dangerous fire andexplosion risk.

Health Hazard

Inhalation or contact with material may irritate or burn skin and eyes. Fire may produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Purification Methods

Distil amylene and collect the distillate at low temperature. It has also been distilled from sodium. FLAMMABLE. It is available in steel cylinders and has a short

Research

2-Methyl-2-butene is a trisubstituted olefin. It acts as guest and forms stable solid host-guest complexes with self-assembled benzophenone bis-urea macrocycles. The impact of active chlorine on photo-oxidation of 2-methyl-2-butene was studied. Photosensitized oxidation of 2-methyl-2-butene adsorbed on internal framework of Na-ZSM-5 zeolite was studied. Gas-phase reaction of 2-methyl-2-butene with ozone has been investigated. Kinetics of liquid-phase alkylation of 3-methylthiophene with 2-methyl-2-butene on supported phosphoric acid has been reported.

Toxics Screening Level

The initial threshold screening level (ITSL) for amylene (also called 2-methyl-2-butene) is 106 μg/m3 (annual averaging time).

References

Virginie Bellière, Christophe Geantet, Michel Vrinat, Younès Ben-Taarit, Yuji Yoshimura, Alkylation of 3-Methylthiophene with 2-Methyl-2-butene over a Zeolitic Catalyst, Energy & Fuels, 2004, vol. 18, pp. 1806-1813
D. Grosjean, Gas-phase reaction of ozone with 2-methyl-2-butene: dicarbonyl formation from Criegee biradicals, Environmental Science & Technology, 1990, vol. 24, pp. 1428-1432

2-Methyl-2-butene Preparation Products And Raw materials

• Raw materials: Isoprene-->3-Methyl-1-butene-->C5 Fraction-->p-tert-amyl aniline-->3,3-Dimethylcyclobutene-->1,1-dimethylcyclobutane-->1,2,4-Trimethylbenzene-->2-Butene-->2-METHYL-1-BUTENE-->CIS-1,3-PENTADIENE
• Preparation Products: Triadimefon-->β-Carotene-->pinacolone，tert-butyl methy1 ketone，3，3-dimethyl-2-butyl ketone-->N,N-DiMethylMethyleneaMMoniuM Iodide-->2,2-Dimethylbutyric acid-->CIS-3,4-DIMETHYL-2-PENTENE-->3,4,4-TRIMETHYLCYCLOPENT-2-ENONE-->1,1,2,3,3-pentamethylindan-->3-ETHYL-2-PENTENE-->2-METHYL-2-PENTENE-->2-METHYL-2-BUTANETHIOL