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(sī'kləhĕk`sān), C6H12, colorless liquid hydrocarbon. It is a cyclic alkane that melts at 6°C; and boils at 81°C;. It is nearly insoluble in water. Cyclohexane is found naturally to some extent in petroleum but is prepared commercially by catalytic hydrogenation of benzene. It is widely used as a solvent and in making certain compounds used in the preparation of nylon.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a saturated alicyclic hydrocarbon. A cycloalkane, cyclohexane has the structural formula

It is a colorless liquid with a characteristic odor. It has a melting point of 6.55°C, a boiling point of 80.74°C, and a density of 0.778 g/cm3 at 20°C. Insoluble in water, cyclohexane is miscible with ether, acetone, and benzene. It has two possible conformations —the “boat” and “chair” forms; the latter predominates at normal temperatures.

Cyclohexane is a component of virtually all petroleums, but it is present only in small amounts. It is therefore produced in industry mainly by the catalytic hydrogenation of benzene. It is used as a raw material for the production of cyclohexanol and cyclohexanone (by oxidation with oxygen), nitrocyclohexane (by the action of 30-percent nitric acid or nitrogen dioxide), and cyclohexanone oxime (by nitrosation using NOCl); all of these substances are intermediates in the production of caprolactam and adipic acid by catalytic oxidation. Both caprolactam and adipic acid are used in the production of polyamides.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(organic chemistry)
C6H12 A colorless liquid that is a cyclic hydrocarbon synthesized by hydrogenation of benzene; used in organic synthesis. Also known as hexamethylene.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The presence of the cyclohexane moiety along with saturated hydrocarbon chain was also supported by comparison with similar compounds in literature [12]: I' 37.0 (C-1), I' 34.1 (C-2 and C-6), I' 27.0 (C-3 and C-5), I' 64.5 (C-1'), I' 29.8 - 24.4 (C-2' - C-25').
The solubility of water in an organic solvent such as cyclohexane (0.00345M) [15] used in our experimental study is very small and the evaporative loss of water from the suspended aqueous droplet is assumed to be negligibly small.
The weighed GFFs (glass fiber filters) were used for extraction using cyclohexane for 24 h in Soxhlet apparatus.
Ribaucour, "Detailed chemical kinetic modeling of cyclohexane oxidation," The Journal of Physical Chemistry A, vol.
1, Methane; 2, ethane; 3, propane; 4, isobutane; 5, n-butane; 6, neopentane; 7, isopentane; 8, n-pentane; 9, methyl cyclopentane; 10, cyclohexane; 11, 2-methylpentane; 12, 3-methylpentane; 13, n-hexane; 14, 2,2/3,3-dimethyl pentane; 15, methyl cyclohexane; 16, 2/3methylhexane +2,3-dimethyl pentane; 17, n-heptane; 18, benzene; 19, n-octane; 20, methylbenzene; 21, n-nonane; 22, ethylbenzene; 23, p-xylene; 24, o-xylene.
The absorbance at 233 and 270 nm was determined using a Varian DMS 80 spectrophotometer after diluting oil in cyclohexane (1/100, v/v).
In the control soil, apart from Lambdacyhalothrin the various metabolites obtained were Isopropyl benzene, 2-ethyl-1,3-dimethyl benzene, 1,2,3,4-tetra methyl5-methylene 1,3-cyclopentadiene, 4- methyl benzoic acid pentafluoro phenyl ester, 1 methyl-4- (1-methyl ethyl)- cyclohexane (Fig 1, table 2).Lambdacyhalothrin residue also was persistence in Bacillus cereus inoculated soil containing 500 ppm Lambdacyhalothrin.
* DINCH[R] (Di-isononyl cyclohexane dicarboxylate) - nothing to do with the Dr.
Completed in April 1999 and inaugurated in February 2000, it can turn over 500,000 t/y of benzene partly used to produce 220,000 t/y of cyclohexane, a feedstock to make plastics, and 80,000 t/y of gasoline.
The precursors for the process (cyclohexane and tetra methyl silane) are taken in liquid form in metal containers and injected to the chamber after vaporizing through warming.