Ethylidene norbornene
Ethylidene norbornene (ENB) is an organic compound that consists of an ethylene group attached to norbornene. It is a colorless liquid. The molecule consists of two sites of unsaturation, one of which participates in the copolymerization and the second of which (the ethylidene) undergoes vulcanization. It is a monomer in the production of the commercial polymer EPDM. The compound consists of E- and Z-stereoisomers, but the mixtures are not separated.
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| Other names
2-ethylidene-5-norbornene | |
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| Properties | |
| C9H12 | |
| Molar mass | 120.195 g·mol−1 |
| Appearance | colorless liquid |
| Density | 0.893 g/mL |
| Melting point | −80 °C (−112 °F; 193 K) |
| Boiling point | 146 °C (295 °F; 419 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
It is prepared by isomerization of vinyl norbornene, which in turn is obtained by the Diels-Alder reaction of butadiene and cyclopentadiene.[1]
Ethylidene norbornene can be produced in two steps from cyclopentadiene.
Safety
Its LD50 (intravenous, rabbit) ranges from 0.09 (male rabbit) to 0.11 ml/kg (female). It is also a neurotoxin.[2]
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References
- Behr, Arno (2000). "Organometallic Compounds and Homogeneous Catalysis". Ullmann's Encyclopedia of Industrial Chemistry. p. 10. doi:10.1002/14356007.a18_215.
- Ballantyne, Bryan; Myers, Roy C.; Klonne, Dennis R. (1997). "Comparative acute toxicity and primary irritancy of the ethylidene and vinyl isomers of norbornene". Journal of Applied Toxicology. 17: 211–221. doi:10.1002/(SICI)1099-1263(199707)17:4<211::AID-JAT430>3.0.CO;2-X.CS1 maint: uses authors parameter (link)
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