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प्रश्न
How will you convert benzaldehyde into the following compound?
α-hydroxy phenyl acetic acid
उत्तर
Conversion of benzaldehyde into 2-hydroxy phenyl acetic acid:
\[\begin{array}{cc}
\phantom{................}\ce{H}\phantom{.......................}\ce{H}\phantom{}\\
\phantom{................}|\phantom{........................}|\phantom{}\\
\ce{\underset{(Benzaldehyde)}{C6H5CHO} ->[HCN] C6H5 - C - CN ->[H^+/H2O][excess] C6H5 - C - COOH}\\
\phantom{................}|\phantom{........................}|\phantom{}\\
\phantom{.....................}\ce{\underset{(Phenyl cyanohydrin)}{OH}}\phantom{.......}\ce{\underset{α-hydroxy phenyl acetic acid}{OH}}\phantom{}
\end{array}\]
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\[\begin{array}{cc} \phantom{...}\ce{R}\phantom{.................}\ce{R}\phantom{..}\ce{H}\phantom{................}\\ \phantom{...}\backslash\phantom{..................}\backslash/\phantom{..........}\phantom{.......}\\ \ce{C = O ->[H2NNH2][KOH/glycol] C + N2 + H2O}\\ \phantom{}/\phantom{............}\phantom{.......}/\phantom{}\backslash\phantom{...............}\\ \phantom{}\ce{R}\phantom{..................}\ce{R}\phantom{..}\ce{H}\phantom{...............} \end{array}\]
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