These are derived from aldehydes by replacing one or more of the hydrogen atoms (other than a hydrogen in the aldehyde group (-CHO) by one or more halogens, sulpho groups
(-SO3H), nitro groups (-NO2) or nitroso groups (-NO) or by any combination thereof.
The most important is chloral (trichloroacetaldehyde) (CCl3.CHO); anhydrous, mobile, colourless liquid with a penetrating odour; a hypnotic.
This heading excludes chloral hydrate (CCl3.CH(OH)2) (2,2,2-trichloroethane-1,1-diol) which falls in heading 29.05.
This heading also excludes aldehyde-bisulphite compounds which are classified as sulphonated derivatives of alcohols (headings 29.05 to 29.11).
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