Carbonyl compounds haloform reaction

In the same way as a,a,(Z-trihalogenated carbonyl compounds are cleaved hydrolytically to produce haloforms, the fluorinated analogs also react by release of trifluoromethane. The fluoroform reaction has been described with aldehydes such as trifluoroacetaldehyde, alkyl trifluoromethyl ketones, and aryl trifluoromethyl ketones, e.g. l-(2,4-dihydroxyphcnyl)-... 

A trihalo compound may be formed from the halogenation of a methyl ketone. The electron-withdrawing effect of the trihalomethyl group makes the carbonyl group very sensitive to nucleophilic addition. Consequently, in the presence of a mild base the trihalomethyl compound easily decomposes with the formation of chloroform, bromoform or iodoform, depending on the halogen. The other product of the haloform reaction is a carboxylic acid (Scheme 3.86). 

In base, up to three a hydrogens can be replaced by X the trihalo carbonyl compounds react further In the haloform reaction... 

Haloform reaction (Section 19.4) The conversion of a methyl ketone into a molecule of a carboxylic acid and a molecule of haloform.The trihalo carbonyl compound is formed, base adds to the carbonyl group, and the trihalomethyl anion is... 

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