Dichloroacetaldehyde
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IUPAC name 2,2-dichloroethanal | |
Other names dichloroethanal | |
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ChEBI |
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ECHA InfoCard | 100.001.063 |
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UN number | 1993 |
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Properties | |
Chemical formula | C2H2Cl2O |
Molar mass | 112.94 g·mol−1 |
Density | 1.4 g/mL |
Melting point | −50 °C (−58 °F; 223 K) |
Boiling point | 88 °C (190 °F; 361 K) |
Solubility in water | forms hydrate |
Related compounds | |
Related compounds | chloroacetaldehyde, trichloroacetaldehyde |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Dichloroacetaldehyde is a chlorinated aldehyde with the chemical formula HCCl2CHO. Along with monochloroacetaldehyde and trichloroacetaldehyde, it is one of the three possible chlorinated acetaldehydes.
Properties and reactions
Dichloroacetaldehyde is a highly volatile liquid that is easily soluble in water to form Hydrates. A geminal diol, also known as monohydrate, 2,2-dichloro-1,1-ethanediol, is formed in water.[1]
The compound decomposes when heated. In the presence of Lewis acids such as antimony trichloride, iron(III) chloride, aluminum trichloride, tin(IV) chloride or boron trifluoride, the trimer hexachloroparaldehyde (2,4,6-tris(dichloromethyl)-1,3,5-trioxane) can be obtained.[1] The trimer forms colourless crystals that melt at 131–132 °C. At the boiling point of 210–220 °C, dichloroacetaldehyde decomposes.[1]
Reduction with lithium aluminium hydride gives dichloroethanol.[2]
Uses
Dichloroacetaldehyde is used to produce other chemical compounds such as mitotane.[3] Condensation with chlorobenzene yields p,p′-dichloro-1,1-diphenyl-2,2-dichloroethane, which was previously used as an insecticide:[1]
Synthesis
Dichloroacetaldehyde can be obtained by chlorinating acetaldehyde or paraldehyde. Hypochlorination of 1,2-dichloroethylene using chlorine and water produces pure dichloroacetaldehyde.[1][4]
References
- ^ a b c d e Jira, R.; Kopp, E.; McKusick, B.C.; Röderer, G.; Bosch, A.; Fleischmann, G.: Chloroacetaldehydes in Ullmann’s Encyclopedia of Industrial Chemistry, 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, doi:10.1002/14356007.a06_527.pub2.
- ^ Sroog, C. E.; Woodburn, H. M. (1952). "2,2-Dichloroethanol". Organic Syntheses. 32: 46. doi:10.15227/orgsyn.032.0046.
- ^ Ullmann, Fritz (2000). Ullmann's Encyclopedia of Industrial Chemistry. Vol. 1 (6th ed.). Germany: Wiley. ISBN 9783527306732.
- ^ NLM Hazardous Substances Data Bank entry for Dichloroacetaldehyde