Making a tertiary amine
And still it doesn't
stop! The diethylamine also reacts with bromoethane - in the same two stages as
before.
In the first stage, you
get triethylammonium bromide.
There is again the
possibility of a reversible reaction between this salt and excess ammonia in
the mixture.
The ammonia removes a
hydrogen ion from the triethylammonium ion to leave a tertiary amine -
triethylamine. A tertiary amine is one which has three alkyl groups attached to
the nitrogen.
Making a quaternary
ammonium salt
The final stage! The
triethylamine reacts with bromoethane to give tetraethylammonium bromide - a
quaternary ammonium salt (one in which all four hydrogens have been replaced by
alkyl groups).
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