Question

Write the equations for the preparation of 1-iodobutane from

(i) 1-butanol

(ii) 1-chlorobutane

(iii) but-1-ene.

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Answer

Here are the equations for the preparation of 1-iodobutane from different starting materials:

(i) From 1-butanol

1-Butanol reacts with sodium or potassium iodide in the presence of phosphoric acid: $$ \text{CH}_3(\text{CH}_2)_3\text{OH} + \text{HI} \rightarrow \text{CH}_3(\text{CH}_2)_3\text{I} + \text{H}_2\text{O} $$

(ii) From 1-chlorobutane

1-Chlorobutane reacts with sodium iodide in dry acetone (Finkelstein reaction): $$ \text{CH}_3(\text{CH}_2)_3\text{Cl} + \text{NaI} \rightarrow \text{CH}_3(\text{CH}_2)_3\text{I} + \text{NaCl} $$

(iii) From but-1-ene

But-1-ene reacts with hydrogen iodide (HI): $$ \text{CH}_2=\text{CH}(\text{CH}_2)_2 + \text{HI} \rightarrow \text{CH}_3(\text{CH}_2)_3\text{I} $$

In each case, the reactions yield 1-iodobutane as the final product.


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