145491

2,3-Dimethyl-1,3-butadiene

98%, contains 100 ppm BHT as stabilizer

• Synonym(s): 2,3-Dimethylbuta-1,2-diene, 2,3-Dimethylenebutane, Biisopropenyl, Diisopropenyl
• Linear Formula: CH₂=C(CH₃)C(CH₃)=CH₂
• CAS Number: 513-81-5
• Molecular Weight: 82.14
• Beilstein: 605285
• EC Number: 208-172-0
• MDL number: MFCD00008595
• UNSPSC Code: 12352100
• PubChem Substance ID: 24848729
• NACRES: NA.22

Properties

• vapor pressure: 269 mmHg ( 37.7 °C)
• Assay: 98%
• form: liquid
• contains: 100 ppm BHT as stabilizer
• refractive index: n20/D 1.438 (lit.)
• bp: 68-69 °C (lit.)
• mp: −76 °C (lit.)
• density: 0.726 g/mL at 25 °C (lit.)
• storage temp.: 2-8°C
• SMILES string: CC(=C)C(C)=C
• InChI: 1S/C6H10/c1-5(2)6(3)4/h1,3H2,2,4H3
• InChI key: SDJHPPZKZZWAKF-UHFFFAOYSA-N

Description

General description

2,3-Dimethyl-1,3-butadiene (DMBD) is a conjugated diene. It undergoes Diels Alder cycloaddition reaction with 2-thio-3-chloroacrylamides under thermal, catalytic and microwave conditions. It undergoes thermal [4+2] cycloaddition reaction with 3-acetyl-, 3-carbamoyl and 3-ethoxycarbonylcoumarins under solvent free conditions. DMBD participates in polymerization reactions in the presence of iron dichloride complexes based catalysts.

Application

2,3-Dimethyl-1,3-butadiene was used to investigate the reactions of 1,3-dienes with the Si(001) surface using scanning tunneling microscopy and fourier transform infrared spectroscopy.
It may be used in the following processes:

• Preparation of 1,3,6-triene derivatives of corresponding 1-aryl-substituted 1,3-dienes by 1,4-hydrobutadienylation in the presence of cobalt catalyst.
• Synthesis of 6-aryl(hetaryl)-3,4-dimethyl-1-nitro-1-cyano-3-cyclohexenes by reacting with gem-cyanonitroethenes.
• As a halogen trap during the study of the photolysis reaction of dibromo adduct of 2,5-diphenyltellurophene.

Safety Information

• Pictograms: GHS02
• Signal Word: Danger
• Hazard Statements: H225
• Precautionary Statements: P210 - P233 - P240 - P241 - P242 - P243
• Hazard Classifications: Flam. Liq. 2
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 3
• Flash Point(F): 30.2 °F - closed cup
• Flash Point(C): -1 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves