1,3,5-hexatriene Property

Melting point:

-11.7°C

Boiling point:

76-79°C

Density 

0,737 g/cm³

refractive index 

n20/D 1.511(lit.)

Flash point:

38 °C

storage temp. 

−20°C

EPA Substance Registry System

1,3,5-Hexatriene (2235-12-3)

Safety

Hazard Codes 

Xn

Risk Statements 

10-22-36-65

Safety Statements 

26-36-62

RIDADR 

1992

RTECS 

MP5425000

HazardClass 

3.2

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H226Flammable liquid and vapour

H302Harmful if swallowed

H304May be fatal if swallowed and enters airways

H319Causes serious eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P330Rinse mouth.

P501Dispose of contents/container to..…

1,3,5-hexatriene Chemical Properties,Usage,Production

Description

1,3,5-hexatriene is the simplest conjugated triene, and its structure predicts two geometrical isomers, the cis form being the open chain analog of benzene.

With a single sigma bond separating the pi bonds of 1,3,5-hexatriene it is a conjugated system and some of the pi electron density will be delocalized between each of the C-C bonds, not just those written as double bonds in the Lewis structure. There are six adjacent carbon atoms involved in the pi system and the combination of a p orbital from each of these six atoms will result in six pi molecular orbitals: ψ1, ψ2, ψ3, ψ4*, ψ5*, and ψ6* (also referred to as π1, π2, π3, π4*, π5*and π6*).

Preparation

1,3,5-Hexatriene has been prepared by pyrolysis of s-divinylglycol diformate, condensation of allyl chloride with sodamide, phthalic anhydride dehydration of 1,5-hexadiene-3-ol and debromination of 3,4-dibromohexa-diene-1,5 with zinc. The product in method contained cyclohexadiene, and the purification of the substance seems to have been incomplete in all cases.