CAS number 108-93-0 YesY
PubChem 7966
ChemSpider 7678 YesY
EC-number 203-630-6
DrugBank DB03703
KEGG C00854 YesY
ChEBI CHEBI:18099 YesY
RTECS number GV7875000
Jmol-3D images Image 1
Molecular formula C6H12O
Molar mass 100.158 g/mol
Appearance Colorless, viscous liquid.
Density 0.962 g/mL, liquid
Melting point

25.93 °C, 299 K, 79 °F

Boiling point

160.84 °C, 434 K, 322 °F

Solubility in water 3.60 g/100 mL (20 °C)
Acidity (pKa) 16
Viscosity 41.07 mPa·s (30 °C)
MSDS MSDS for cyclohexanol
R-phrases R20 R22 R37 R38
S-phrases S24 S25
Main hazards Flammable, skin irritant
Reacts violently with oxidizing agents
Flash point 67 °C
LD50 2.06 g/kg (oral, rat)
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Cyclohexanol is the organic compound with the formula (CH2)5CHOH. The molecule is related to cyclohexane ring by replacement of one hydrogen atom by a hydroxyl group.[2] This compound exists as a deliquescent colorless solid, which, when very pure, melts near room temperature. Billions of kilograms are produced annually, mainly as a precursor to nylon.[3]



Cyclohexanol is produced by the oxidation of cyclohexane in air, typically using cobalt catalysts:[3]

C6H12 + 1/2 O2 → C6H11OH

This process co-forms cyclohexanone, and this mixture ("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. Alternatively, cyclohexanol can be produced by the hydrogenation of phenol:

C6H5OH + 3 H2 → C6H11OH

This process can also be adjusted to favor the formation of cyclohexanone.

Basic reactions

Cyclohexanol undergoes the main reactions expected for a secondary alcohol. Oxidation gives cyclohexanone, which is converted on a large scale in industry to the oxime, a precursor to caprolactam. As a laboratory exercise, this oxidation can be effected with chromic acid. Esterification affords the commercially useful derivatives dicyclohexyladipate and dicyclohexylphthalate, which are used as plasticizers. Heating in the presence of acid catalysts converts cyclohexanol to cyclohexene.[3]


Cyclohexanol has at least two solid phases. One of them is a plastic crystal.


As indicated above, cyclohexanol is an important feedstock in the polymer industry, firstly as a precursor to nylons, but also to various plasticizers. Small amounts are used as a solvent.


Cyclohexanol is somewhat toxic: the TLV for the vapor for 8 h is 50 ppm.[3] Few studies have been done on its carcinogenicity, but one study on rats found it to have co-carcinogenic effects.[4]


  1. ^ Merck Index, 11th Edition, 2731.
  2. ^ Lide, D. R., ed (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 
  3. ^ a b c d Michael Tuttle Musser "Cyclohexanol and Cyclohexanone" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.
  4. ^ [1] Lucrecia Márquez-Rosado, Cristina Trejo-Solís 2, María del Pilar Cabrales-Romero, Evelia Arce-Popoca, Adolfo Sierra-Santoyo, Leticia Alemán-Lazarini, Samia Fatel-Fazenda, Claudia E. Carrasco-Legleu, Saúl Villa-Treviño, "Co-carcinogenic effect of cyclohexanol on the development of preneoplastic lesions in a rat hepatocarcinogenesis model", Molecular Carcinogenesis, Vol. 46, No. 7, Pages 524 - 533, March 2007.

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Look at other dictionaries:

  • Cyclohexanol — Général Nom IUPAC C …   Wikipédia en Français

  • cyclohexanol — ● cyclohexanol nom masculin Alcool secondaire (CH2)5CHOH, dérivé du cyclohexane. (C est un liquide bouillant vers 160 °C, dont les esters sont employés comme solvants et plastifiants des matières plastiques.) …   Encyclopédie Universelle

  • Cyclohexanol — Strukturformel Allgemeines Name Cyclohexanol Andere Namen …   Deutsch Wikipedia

  • Cyclohexanol — Cy|c|lo|he|xa|nol [↑ Cyclohexan u. ↑ ol (1)], das; s; Syn.: (Jargon:) Anol: farbloser sekundärer Alkohol, Smp. 25 °C, der als Lsgm., haupts. aber zur Herst. von Adipinsäure u. Cyclohexanon benutzt wird. * * * Cyclohexanol,   einwertiger… …   Universal-Lexikon

  • cyclohexanol — cikloheksanolis statusas T sritis chemija formulė CH₂(CH₂)₄CHOH atitikmenys: angl. cyclohexanol rus. циклогексанол …   Chemijos terminų aiškinamasis žodynas

  • Cyclohexanol dehydrogenase — Identifiers EC number CAS number 63951 98 4 …   Wikipedia

  • cyclohexanol phthalate — noun the cyclohexanol ester of phthalic acid (Freq. 1) • Hypernyms: ↑ester …   Useful english dictionary

  • cyclohexanol — noun The alicyclic alcohol derived from cyclohexane by replacement of a hydrogen atom with a hydroxyl group …   Wiktionary

  • cyclohexanol — cy·clo·hex·a·nol (si″klo hekґsə nol) the monohydroxy derivative of cyclohexane; used as a solvent and blending agent …   Medical dictionary

  • cyclohexanol — cy·clo·hex·a·nol …   English syllables

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