Aldehydes and Ketones - Result Question 56
66.
(a) Compound $A\left(C _8 H _8 O\right)$ on treatment with $NH _2 OH$. $HCl$ given $B$ and $C . B$ and $C$ rearrange to give $D$ and $E$, respectively, on treatment with acid. $B, C, D$ and $E$ are all isomers of molecular formula $\left(C _8 H _9 NO\right)$. When $D$ is boiled with alcoholic $KOH$, an oil $F\left(C _6 H _7 N\right)$ separates out. $F$ reacts rapidly with $CH _3 COCl$ to give back $D$. On the other hand, $E$ on boiling with alkali followed by acidification gives a white solid $G\left(C _7 H _6 O _2\right)$. Identify $A$ - $G$.
(b) Carry out the following transformation in not more than three steps.
$1$-butyne $\longrightarrow 2$-pentanone
(1999, 3M)
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Solution:
- (a) $G$ is benzoic acid $C _6 H _5-COOH, B$ and $C$ are two stereomeric oximes which undergo Beckmann’s rearrangement on treatment with acid to give amides $D$ and $E$.
BETA
