Vinyl norbornene

Vinyl norbornene (VNB) is an organic compound that consists of a vinyl group attached to norbornene. It is a colorless liquid. The compound exists as endo and exo isomers, but these are not typically separated. It is an intermediate in the production of the commercial polymer EPDM. It is prepared by the Diels–Alder reaction of butadiene and cyclopentadiene.^[1]

Vinyl norbornene is an intermediate in the production ethylidene norbornene.

Vinyl norbornene

Names
IUPAC name 5-Ethenylbicyclo[2.2.1]hept-2-ene
Other names 2-Ethylidene-5-norbornene; 5-Vinyl-2-norbornene
Identifiers
CAS Number	3048-64-4 Y
3D model (JSmol)	Interactive image
PubChem CID	18273
UNII	O26JW4DH9I Y
InChI InChI=1S/C9H12/c1-2-8-5-7-3-4-9(8)6-7/h2-4,7-9H,1,5-6H2 Key: INYHZQLKOKTDAI-UHFFFAOYSA-N
SMILES C=CC1CC2CC1C=C2
Properties
Chemical formula	C9H12
Molar mass	120.195 g·mol−1
Appearance	Colorless liquid
Boiling point	141 °C (286 °F; 414 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Safety

LD₅₀ is 0.10–0.05 mg/kg (intravenous, female rabbit). It is also a neurotoxin.^[2]