1,7-Octadiene

1,7-Octadiene is an organic compound with the formula (CH₂=CHCH₂CH₂)₂. It is a colorless liquid that serves as a precursor to specialty polymers. It arises commercially by the dimerization of butadiene in the presence of hydrogen. Some of the 1,6-octadiene is also formed. 1,7-Octadiene can be converted to the diol by hydroformylation followed by hydrogenation of the dialdehyde. In a related process, 1,7-Octadiene undergoes hydrocyanation to give dinitrile, which can be hydrogenated to give 1,10-diaminodecane.^[1]

Conversion of butadiene to 1,10-difunctionalized decanes

1,7-Octadiene

Names
Preferred IUPAC name Octa-1,7-diene
Identifiers
CAS Number	3710-30-3
3D model (JSmol)	Interactive image
ChEBI	CHEBI:183652
ChemSpider	18338
ECHA InfoCard	100.020.959
EC Number	223-054-9
PubChem CID	19460
RTECS number	RG5250000
UNII	N4H29T34J2
UN number	2309
CompTox Dashboard (EPA)	DTXSID6063147
InChI InChI=1S/C8H14/c1-3-5-7-8-6-4-2/h3-4H,1-2,5-8H2 Key: XWJBRBSPAODJER-UHFFFAOYSA-N
SMILES C=CCCCCC=C
Properties
Chemical formula	C8H14
Molar mass	110.200 g·mol−1
Appearance	Colorless liquid
Density	0.746 g/mL at 25 °C
Boiling point	114–121 °C (237–250 °F; 387–394 K)
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H304, H410, H412
Precautionary statements	P210, P233, P240, P241, P242, P243, P280, P303+P361+P353, P370+P378, P403+P235, P501
Related compounds
Related alkenes and dienes	Isoprene Chloroprene
Related compounds	Butane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Dimethyloctadienes

Structurally related octadienes bearing two methyl groups are of commercial interest. Such compounds are produced by pyrolysis of pinane, which is abundantly available from terpentine or related wood-derived chemicals.^[2]

Formation of dimethyloctadienes

Research

The diene has also been the subject of many research papers. For example, with ethylene it undergoes a cross-enyne metathesis Diels–Alder reaction.^[3] It undergoes ring-closing metathesis to give cyclooctene.^[4] Plasma polymerized 1,7-octadiene films deposited on silica can produce particles with tuned hydrophobicity.^[5]