# (a) How will you convert methyl bromide to dimethylamine? (b) How will you prepare propanamine from methyl chloride using suitable reactions?

Dec 6, 2016

$\text{a)}$ React it with excess ${\text{NH"_2"CH}}_{3}$, ethanol and $\text{NaOH}$
$\text{b)}$ I'm not sure how to make propyl amine from methyl chloride, unless you are talking about $N$-methylethylamine. If you are, it's the same process as in $\text{a)}$, except that the reactant is ${\text{C"_2"H"_5"NH}}_{2}$.

#### Explanation:

Amines can be synthesised from haloalkanes in nucleophilic substitution reactions. The product of this substitution is an ammonium salt. An amine is generated by reacting the salt with alkali.

Ethanol is used as a solvent to stop the haloalkane forming an alcohol.

$\text{a)}$ ${\text{CH"_3"Br"+"NH"_2"CH"_3 rarr "CH"_3"NH"_2"CH"_3^+"Br}}^{-}$

$\textcolor{w h i t e}{a}$ $\text{CH"_3"NH"_2"CH"_3^+"Br"^(-)+"NaOH" rarr "CH"_3"NH""CH"_3+"NaBr"+"H"_2"O}$