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Cyclohexanone: Wikis


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Skeletal formula of cyclohexanone
Conformation of cyclohexanone
Ball-and-stick model of cyclohexanone
Side-on view of ball-and-stick model of cyclohexanone
CAS number 108-94-1 Yes check.svgY
Molecular formula C6H10O
Molar mass 98.15 g/mol
Appearance Colorless, liquid
Density 0.9478 g/mL, liquid
Melting point

−16.4 °C

Boiling point

155.65 °C

Solubility in water Slightly soluble
Solubility in ethanol Miscible
Viscosity 2.02 cP at 25 °C[3]
Std enthalpy of
−270.7 kJ mol−1
Std enthalpy of
−3519.3 kJ/mol−1
Standard molar
+229.03 J.K−1.mol−1
EU classification Harmful (Xn)
R-phrases R10, R20
S-phrases (S2), S25
NFPA 704
NFPA 704.svg
Flash point 44 C
Related compounds
Related ketones Cyclopentanone
Related compounds Cyclohexanol
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Cyclohexanone is the organic compound with the formula (CH2)5CO. The molecule consists of six-carbon cyclic molecule with a ketone functional group. This colorless oil has an odor reminiscent of peardrop sweets as well as acetone. Over time, samples assume a yellow color due to oxidation. Cyclohexanone is slightly soluble in water (5-10 g/100 mL), but miscible with common organic solvents. Billions of kilograms are produced annually, mainly as a precursor to nylon.[4]



Cyclohexanone is produced by the oxidation of cyclohexane in air, typically using cobalt catalysts:[4]

C6H12 + O2 → (CH2)5CO + H2O

This process co-forms cyclohexanol, and this mixture, called "KA oil" for ketone-alcohol oil, is the main feedstock for the production of adipic acid. The oxidation involves radicals and the intermediacy of the hydroperoxide C6H11O2H. In some cases, purified cyclohexanol, obtained by hydration of cyclohexene, is the precursor. Alternatively, cyclohexanone can be produced by the partial hydrogenation of phenol:

C6H5OH + 2 H2 → (CH2)5CO

This process can also be adjusted to favor the formation of cyclohexanol.[4]


Laboratory methods

Cyclohexanone can be prepared from cyclohexanol by oxidation with chromic oxide.


The great majority of cyclohexanone is consumed in the production of precursors to Nylon 6,6 and Nylon 6. About half of the world's supply is converted to adipic acid, one of two precursors for nylon 6,6. For this application, the KA oil (see above) is oxidized with nitric acid. The other half of the cyclohexanone supply is converted to the oxime. In the presence of sulfuric acid catalyst, the oxime rearranges to caprolactam, a precursor to nylon 6:[4]

Caprolactam Synth.png


Like cyclohexanol, cyclohexanone is not carcinogenic and is only moderately toxic, with a TLV of 25 ppm for the vapor. It is an irritant.[4]

A recent study of plastic tubing used in medical procedures that circulate blood outside the body suggests a link between this compound and decreased heart function, swelling, loss of taste and short term memory loss.[5]


  1. ^ International Chemical Safety Card 0425
  2. ^ NIOSH Pocket Guide to Chemical Hazards
  3. ^ [ Data extract from Landolt-Börnstein IV/25: Viscosity of Pure Organic Liquids and Binary Liquid Mixtures]
  4. ^ a b c d e Michael T. Musser "Cyclohexanol and Cyclohexanone" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.doi:10.1002/14356007.a08_217
  5. ^


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