Aliphatic Compounds Containing Nitrogen - Result Question 5
5. Which of the following amines can be prepared by Gabriel phthalimide reaction?
(2019 Main, 8 April I)
(a) $n$ - butylamine
(b) triethylamine
(c) $t$-butylamine
(d) neo -pentylamine
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Answer:
Correct Answer: 5. (a)
Solution:
$n$-butylamine $\left(CH _3 CH _2 CH _2 CH _2 NH _2\right)$ can be prepared by Gabriel phthalimide reaction. This method produces only primary amines without the traces of secondary or tertiary amines. In this method, phthalimide is treated with ethanolic $KOH$, it forms potassium salt of phthalimide which on heating with alkyl halide followed by alkaline hydrolysis forms corresponding primary amines.
Triethylamine, $t$-butylamine and neo-pentylamine cannot be prepared by Gabriel phthalimide reaction.
BETA
