Primary Amines can be prepared from haloalkanes in a two step process:
1. Haloalkane reacts with Cynaide ion in ethanol. The cynanide ion replaces the halogen to from a nitrile.
RCl + CN- --> R----C-= N + Cl-
2. The -C-= N functional group is reduced to a primary amine via cataylitic hydrogenation:
R-C=-N + 2 lots of hydrogen gas --> a primary amine.
This is purer than than the nuclophilic subsitution because only a primary amine is made,.
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