Carboxylic Acids and their Derivatives 2 Question 57
57. Write down the reactions involved in the preparation of the following using the reagents indicated against in parenthesis.
“Propionic anhydride from propionaldehyde”
$$ \left[\mathrm{AgNO}{3}, \mathrm{NH}{4} \mathrm{OH}, \mathrm{P}{2} \mathrm{O}{5}\right] $$
$(1984,2 M)$
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Solution:
- $\mathrm{CH}{3} \mathrm{CH}{2} \mathrm{CHO}+\mathrm{AgNO}{3} \xrightarrow{\mathrm{NH}{4} \mathrm{OH}} \mathrm{CH}{3} \mathrm{CH}{2} \mathrm{COOH}$
$$ \xrightarrow[\Delta]{\mathrm{P}{2} \mathrm{O}{5}}\left(\mathrm{CH}{3} \mathrm{CH}{2} \mathrm{CO}\right)_{2} \mathrm{O} $$
