/duy klawr'euh ben"zeen, -ben zeen", -klohr'-/, n. Chem.
any of three isomers consisting of benzene in which two of the hydrogen atoms are replaced by chlorine atoms: ortho-, meta-, and paradichlorobenzene.

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      any of three isomeric organohalogen compounds (organohalogen compound) known as 1,2-, 1,3-, or 1,4-dichlorobenzene (also called ortho-, meta-, and para-dichlorobenzene, respectively). Both 1,2- and 1,3-dichlorobenzene are liquids. 1,2-Dichlorobenzene is used as a solvent, as an insecticide, and in the manufacture of other chemicals, particularly dyestuff intermediates. 1,4-Dichlorobenzene is a crystalline, volatile solid with a strong camphorlike odour and is widely used as a moth repellent. All three compounds are colourless, denser than water, and insoluble in water.

      A mixture of the three dichlorobenzenes is produced by the chlorination of chlorobenzene or by the dichlorination of benzene in the presence of iron(III) chloride. The 1,4- isomer is the most easily isolated of the dichlorobenzenes and was first described in 1864; the 1,2- and 1,3- isomers were not recognized until 1875.

Francis A. Carey

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Universalium. 2010.

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  • Dichlorobenzene — There are three distinct chemical compounds which are dichlorobenzenes: 1,2 Dichlorobenzene or ortho dichlorobenzene; 1,3 Dichlorobenzene or meta dichlorobenzene; 1,4 Dichlorobenzene or para dichlorobenzene. This disambiguation page lists… …   Wikipedia

  • dichlorobenzene — noun Date: 1873 any of three isomeric compounds C6H4Cl2; especially paradichlorobenzene …   New Collegiate Dictionary

  • dichlorobenzene — noun Either of three isomeric derivatives of benzene in which two hydrogen atoms have been replaced by chlorine; they are used as solvents and in organic synthesis …   Wiktionary

  • dichlorobenzene — An insecticide used chiefly as a moth repellent. * * * di·chlo·ro·ben·zene (.)dī .klōr ə ben .zēn, .klȯr , (.)ben n any of three isomeric benzene derivatives C6H4Cl2 (as paradichlorobenzene) that differ in the relative placements of the two… …   Medical dictionary

  • dichlorobenzene — di·chlo·ro·benzene …   English syllables

  • dichlorobenzene — /ˌdaɪklɔroʊˈbɛnzin/ (say .duyklawroh benzeen) noun → paradichlorobenzene …  

  • dichlorobenzene — “+ noun Etymology: International Scientific Vocabulary dichlor + benzene : any of three isomeric compounds C6H4Cl2 made by chlorinating benzene: as a. : orthodichlorobenzene b …   Useful english dictionary

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