Why nai in acetone is used instesd of nacl or nabr?
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Finkelstein reaction is particularly useful for preparing iodoalkanes. The iodoalkanes are obtained by heating chloro or bromoalkanes with a concentrated solution of sodium iodide in dry acetone.
R−X + NaI−→−−−−−−−acetone, refluxR−I +NaX
(X=Cl, Br; R=alkyl group)
Sodium chloride and sodium bromide being less soluble in acetone get precipitated from the solution and can be removed by filtration. This also prevents the backward reaction to occur according to Le Chatelier's principle. The reaction gives the best results with primary halides.
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