Norbornene

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Norbornene[1]
Norbornene.png Norbornene2.png
Norbornene3.png
Identifiers
CAS number 498-66-8 YesY
PubChem 10352
ChemSpider 9925
EC number 207-866-0
Jmol-3D images Image 1
Properties
Molecular formula C7H10
Molar mass 94.15 g mol−1
Appearance White solid
Melting point 42 to 46 °C (108 to 115 °F; 315 to 319 K)
Boiling point 96 °C (205 °F; 369 K)
Hazards
NFPA 704
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline) Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point −15 °C (5 °F; 258 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Norbornene or norbornylene or norcamphene is a bridged cyclic hydrocarbon. It is a white solid with a pungent sour odor. The molecule consists of a cyclohexene ring with a methylene bridge between C-3 and C-6. The molecule carries a double bond which induces significant ring strain and significant reactivity.

Norbornene, like many of its derivatives, is made by a Diels-Alder reaction of cyclopentadiene and ethylene.[2][3] Related bicyclics are norbornadiene which has the same carbon skeleton but with two double bonds and norbornane which is completely saturated without double bonds.

Norbornene undergoes an acid-catalyzed hydration reaction with water to form norborneol. This reaction is of great interest to chemists studying non-classical ions.

Polynorbornenes[edit]

Norbornenes are important monomers in ring-opening metathesis polymerizations (ROMP) with for instance the Grubbs' catalyst. Polynorbornenes are polymers with high glass transition temperatures and high optical clarity.[citation needed]

Norbornene ROMP

In addition to ROMP polymerization, norbornene monomers also undergo vinyl-addition polymerization.

Ethylidene norbornene is a related monomer derived from cyclopentadiene and butadiene.

Practical uses[edit]

Norbornene does not have as many practical uses as ethylene or other commodity chemicals. It is utilized to make pharmaceutical intermediates, pesticide compounds, specialty fragrances and in general organic synthesis. When combined with ethylene, norbornene will react and turn into a cyclic olefin copolymer.

Polynorbornene, known under Norsorex, a brand from Astrotech Advanced Elastomerproducts GmbH since 2008, is used mainly in the rubber industry for anti-vibration (rail, building, industry), anti-impact (personal protective equipment, shoe parts, bumpers) and grip improvement (toy tires, racing tires, transmission systems, transports systems for copiers, feeders, etc.)

  • Reachable performances: Loss factors (tan delta) larger than 3, rebounds of less than 1%, tear strengths of 50 N/mm², friction coefficients of 2 and more, Shore hardness between 4 and 90 Shore A.
  • Second main application: oil-binding system with absorption capability of hydrocarbons, 10 times of own weight
  • Norbornene is commonly used in transition metal catalysis to affect migration of electrophilic transition metals [4]

References[edit]

  1. ^ Norbornene MSDS
  2. ^ Paul Binger, Petra Wedemann, and Udo H. Brinker, "Cyclopropene: A New Simple Synthesis and its Diels-Alder Reaction with Cyclopentadiene", Org. Synth. ; Coll. Vol. 10: 231 
  3. ^ Masaji Oda, Takeshi Kawase, Tomoaki Okada, and Tetsuya Enomoto, "2-Cyclohexene-1,4-dione", Org. Synth. ; Coll. Vol. 9: 186 
  4. ^ Thansandote, Praew; Chong, Eugene, Feldmann, Kai-Oliver, Lautens, Mark (21 May 2010). "Palladium-Catalyzed Domino C−C/C−N Coupling Using a Norbornene Template: Synthesis of Substituted Benzomorpholines, Phenoxazines, and Dihydrodibenzoxazepines". The Journal of Organic Chemistry 75 (10): 3495–3498. doi:10.1021/jo100408p. PMID 20423091.