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Chloral

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Chemical name Trichloroethanal
Chemical formula CCl3CH=O
Molecular mass 147.39 g/mol
CAS number [75-87-6]
Density 1.91 g/cm3
Melting point 57 °C
Boiling point 97 °C
SMILES ClC(Cl)(Cl)C=O
[Chemical infoboxDisclaimer and references]

Chloral, also known as trichloroacetaldehyde or trichloroethanal is an organic halide discovered in 1832 by Justus von Liebig. In its pure form, it is a colourless oily liquid soluble in alcohol and ether. In water it reacts to form chloral hydrate, a narcotic substance notorious for its use in "knockout drops" such as the Mickey Finn.

Chloral is produced by chlorination of ethanol:

4 Cl2 + C2H5OH → C2Cl3HO + 5 HCl
The name "chloral" is a portmanteau of "chlorine" and "alcohol", the substances used in its preparation.

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