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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.



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.


(organic chemistry)
C6H12 A colorless liquid that is a cyclic hydrocarbon synthesized by hydrogenation of benzene; used in organic synthesis. Also known as hexamethylene.
References in periodicals archive ?
The results indicate that the content of alkanes decreases with increasing temperature, while the content of cyclohexanes and olefins increases with increasing temperature to a maximum value and then decreases.
The content of alkanes, cyclohexanes and olefins in the light fractions of shale oil after the autoclave pyrolysis (with oversaturated water) at different final temperatures, was detected by GC-MS analysis and presented in Table 8.
They are, however, very useful in combination with opioids or cyclohexanes.
Cyclohexanes (also known as NMDA antagonists) include ketamine and tiletamine.