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Question
Answer in brief.
Write reaction showing conversion of Acetaldehyde into acetaldehyde dimethyl acetal.
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Solution
Step 1:
\[\begin{array}{cc}
\ce{H3C\phantom{..............................}}\ce{H\phantom{.........}}\\
|\phantom{..................................}|\phantom{.........}\\
\phantom{.}\ce{C = O + CH3 - OH ⇌[dry HCl][dil.HCl] H3C - C - OCH3}\\
\phantom{.}|\phantom{..................................}|\phantom{.........}\\
\phantom{..}\ce{\underset{Acetaldehyde}{H}}\phantom{......................}\ce{\underset{Hemiacetal (unstable)}{OH}}\phantom{........}
\end{array}\]
Step 2:
\[\begin{array}{cc}
\ce{H\phantom{.....................................}}\ce{H\phantom{.........}}\\
|\phantom{......................................}|\phantom{.........}\\
\ce{H3C - C - OCH3 + CH3 - OH ⇌[dry HCl][dil.HCl] H3C - C - OCH3 + H2O}\\
|\phantom{......................................}|\phantom{.........}\\
\ce{\underset{Hemiacetal (unstable)}{H}\phantom{....................}}
\ce{\underset{Acetaldehyde dimethyl acetal (stable)}{OCH3}\phantom{.}}
\end{array}\]
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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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\[\begin{array}{cc}
\ce{O}\phantom{........}\\
||\phantom{........}\\
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\end{array}\]
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