Reactions and characterisation of aliphatic ketones

The carbonyl compound may be mixed with an aqueous solution of sodium or potassium cyanide and mineral acid is added, or the bisulphite compound may be treated with an equivalent quantity of sodium cyanide, for example  

Most of the characteristic reactions of ketones (RR CO) depend upon condensation with substituted amines. The reactions occur between the carbonyl group and the —NHj group of the substituted amine, and hence are also shared by aldehydes RHCO  

Many of these are crystalline compounds of sharp m.p. and are therefore useful for identification and characterisation. These include the condensation products with  

This double condensation is prevented by the use of substituted hydrazines. 

The reagent is, however, more expensive than 2 4-dinitrophenylhydr-azine. 

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Reactions and characterisation of aliphatic ketones 111,75. Acetone cyanohydrin. ... 

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