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Question
Write a short note on the following.
Mustard oil reaction
Solution
When primary amines are treated with carbon disuiphide (CS2), N-alkyldithio carbamic acid is formed which on subsequent treatment with HgCI2, gives an alkyl isothiocyanate.
\[\begin{array}{cc}
\phantom{}\ce{S}\phantom{........................}\ce{S}\phantom{...............................}\\
\phantom{}||\phantom{........................}||\phantom{...............................}\\
\ce{CH3 - N - H + C = S -> \underset{(N-methyl dithiocarbamic acid)}{CH3 - NH - C - SH} ->[HgCl2] \underset{\underset{(Mustard oil smell)}{Methyl isothiocyanate}}{CH3 - N = C = S} + HgS + 2HCl}\\
|\phantom{..........................................................................}\\
\ce{\underset{(Methylamine)}{H}}\phantom{..........................................................................}
\end{array}\]
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