Another important reaction for making amines with a 1,3-relationship to a carbonyl group is the
Mannish reaction, You met this in Chapter 27 as a way of doing otherwise unreliable a1do1 additions
to formaldehyde. Because the amine is introduced directly and not by reduction of a nitrile, it can
have two alkyl .groups from the start, Compare this scheme with the one above using a nitrile group
as the source of the amine.