2-METHYL-1,5-HEXADIENE Property

Melting point:

-128.8°C

Boiling point:

92 °C(lit.)

Density 

0.712 g/mL at 25 °C(lit.)

vapor density 

>1 (vs air)

refractive index 

n20/D 1.417(lit.)

Flash point:

10 °F

form 

clear liquid

color 

Colorless to Almost colorless

CAS DataBase Reference

4049-81-4

Safety

Hazard Codes 

F,T

Risk Statements 

11-48/20/21/22-46-45

Safety Statements 

16-29-33-45-53

RIDADR 

UN 3295 3/PG 2

WGK Germany 

3

HS Code 

2901.29.5000

HazardClass 

3

PackingGroup 

II

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H225Highly Flammable liquid and vapour

H340May cause genetic defects

H350May cause cancer

H373May cause damage to organs through prolonged or repeated exposure

Precautionary statements

P202Do not handle until all safety precautions have been read and understood.

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P308+P313IF exposed or concerned: Get medical advice/attention.

2-METHYL-1,5-HEXADIENE Chemical Properties,Usage,Production

General Description

2-Methyl-1,5-hexadiene on mercury-photosensitized irradiation, undergoes internal cycloaddition to afford 1-methylbicyclo[2.1.1]hexane (as major product). High-temperature pyrolysis of 2-methyl-1,5-hexadiene affords 1,5-hexadiene and 2,5-dimethyl-1,5-hexadiene. 2-Methyl-1,5-hexadiene undergoes stereoselective and regioselective reaction with dialkylaluminum chloride (Et₂AlCl) and titanium alkoxide [Ti(OPr-i)₄, a catalyst] followed by oxidation to afford the corresponding five-membered 3-alkylcycloalkyl methanol. 2-Methyl-1,5-hexadiene is formed as a major product during the condensation reaction between allyl chloride and methallyl chloride in the presence of magnesium.