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CYCLOOCTENE

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CYCLOOCTENE Basic information
CYCLOOCTENE Chemical Properties
  • Melting point:−16 °C(lit.)
  • Boiling point:32-34 °C12 mm Hg(lit.)
  • Density 0.848 g/mL at 20 °C(lit.)
  • refractive index n20/D 1.470
  • Flash point:77 °F
  • storage temp. Flammables area
  • solubility H2O: insoluble
  • form Liquid
  • color Clear colorless to light brown
  • Water Solubility Miscible with alcohol and ether. Immiscible with water.
  • Sensitive Air Sensitive
  • BRN 1280166
  • CAS DataBase Reference931-87-3(CAS DataBase Reference)
  • EPA Substance Registry SystemCyclooctene, (1Z)- (931-87-3)
Safety Information
  • Hazard Codes Xn
  • Risk Statements 10-65
  • Safety Statements 29-33
  • RIDADR UN 3295 3/PG 3
  • WGK Germany 3
  • TSCA Yes
  • HazardClass 3
  • PackingGroup III
  • HS Code 29021990
MSDS
CYCLOOCTENE Usage And Synthesis
  • Chemical Propertiesclear colourless to light brown liquid
  • Usescis-Cyclooctene is used as a displaced ligand in chlorobis(cyclooctene)rhodium dimer and chlorobis(cyclooctene)iridium dimer in organometallic chemistry. It acts as a monomer used in synthetic chemistry. It is used to prepare 1-chloro-4-(trichloromethyl) cyclooctane by reaction with carbon tetrachloride using dichlorotris(triphenylphosphine) ruthenium(II) as a catalyst. Further, it is used to study the alkenes chemisorbed on silicon(100) by scanning tunneling microscopy.
  • Synthesis Reference(s)Journal of the American Chemical Society, 102, p. 2693, 1980 DOI: 10.1021/ja00528a029
    The Journal of Organic Chemistry, 40, p. 2555, 1975 DOI: 10.1021/jo00905a040
    Tetrahedron Letters, 14, p. 2667, 1973
  • General Description
    cis-Cyclooctene undergoes addition reaction with carbon tetrachloride catalyzed by dichlorotris(triphenylphosphine) ruthenium(II) to yield 1-chloro-4-(trichloromethyl) cyclooctane (1,4-adduct). It undergoes epoxidation catalyzed by molybdenum oxide nanoparticles incorporated in a mesoporous silica shell coated on dense silica-coated magnetite nanoparticles.
  • Purification MethodsThe cis-isomer is freed from the trans-isomer by fractional distillation through a spinning-band column, followed by preparative gas chromatography on a Dowex 710-Chromosorb W GLC column. It is passed through a short alumina column immediately before use [Collman et al. J Am Chem Soc 108 2588 1986]. It has also been distilled in a dry N2 glove box from powdered fused NaOH through a Vigreux column (p 11), then passed through activated neutral alumina before use [Wong et al. J Am Chem Soc 109 4328 1987]. Alternatively it can be purified via the AgNO3 salt. This salt is obtained from crude cyclooctene (40 mL) by shaking at 70-80o with 50% w/w AgNO3 (2 x 15 mL) to remove cyclooctadienes (aqueous layer). Extraction is repeated at 40o (4 x 20 mL, of 50% AgNO3). Three layers are formed each time. The middle layer contains the AgNO3 adduct of cyclooctene which crystallises on cooling the layer to room temperature. The adduct (complex 2:1) is highly soluble in MeOH (at least 1g/mL) from which it crystallises in large flat needles when cooled at 0o. It is dried under slight vacuum for 1 week in the presence of CaCl2 and paraffin wax soaked in cyclooctene. It has m 51o and loses hydrocarbon on exposure to air. cis-Cyclooctene can be recovered by steam distillation of the salt, collected, dried (CaCl2) and distilled in vacuum. [Braude et al. J Chem Soc 4711 1957, AgNO3: Jones J Chem Soc 1808 1954, Cope & Estes J Am Chem Soc 72 1128 1950, Beilstein 5 I 35, 5 IV 263.] FLAMMABLE LIQUID.
CYCLOOCTENE Preparation Products And Raw materials
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