Aliphatic Compounds Containing Nitrogen - Result Question 9
####9. The major product of the following reaction is
(2019 Main, 10 Jan II)
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Answer:
Correct Answer: 9. (c)
Solution:
- $NaBH _4$ is a selective reducing agent. It can reduce $>C=O$ group into alcohol, $N$-methyl imine group, $Me-N=CH-$ into $2^{\circ}$-amine but cannot reduce an isolated $C=C$.
10 Acetylation by $Ac _2 O / Et _3 N$ is possible with $-NH _2\left(1^{\circ}\right.$-amine $)$ and $-OH$ (alcohol) groups only, but not with ’ $-NH _2$ ’ part of
$-C-NH _2$ (amide) groups, because the $l p$ of nitrogen in amide group is involved in resonance with $\geq C=O$ part.
$\left\lvert, \begin{aligned} & Ac _2 O \text { or }\left(CH _3 CO\right) _2 O(2 \text { moles }) \ & Et _3 N \ & -2 AcOH\end{aligned}\right.$
