
Interpretation: The preparation for the given compound should be determined under given conditions.
Concept Introduction: Sodium cyanoborohydride is a strong reducing agent than sodium borohydride. It reduces the carbonyl group into amine group in a rapid way. So, it is called as reductive amination reactions. One of the essential conditions for reductive amination is that the carbon atom that is connected to nitrogen atom should have one vacant position for the introduction of hydrogen atom. This hydrogen atom comes from the last step of reductive amination of the reduction of C=N bond.
Aldehyde or ketone group is reacted with primary amine in the presence of sodium cyanoborohydride as a reducing agent and a proton source in the reaction medium to produce secondary amines.
Aldehyde or ketone group is reacted with secondary amine in the presence of sodium cyanoborohydride as a reducing agent and a proton source in the reaction medium to produce tertiary amines.
There are two ways to get the starting compounds in either left or right side cleavage of all C−N bonds. After the cleavage, retrosynthetic analysis of the starting materials is done. If both aldehyde/ketone and amine starting materials are decided, reductive amination is followed in both the ways by placing the suitable reagents.

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Chapter 23 Solutions
Organic Chemistry, Binder Ready Version
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