Imine Formation

[eldoctor]

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in TPR Hyperlearning Organic Review, page 686 (2009 ed) talks about Imine formation using a primary amine.

In page 688 it then shows 3 examples, the last one of which does not use the primary amine but rather an amine attached to another N. It does not explain the reasoning for this, so I am confused as to why that is the answer. Anybody?

 

[Rayhaan]

I believe what you are referring to is a hydrazone. Imine's, oximes, hydrazones all look similar with the C=N bond. The difference is what is attached to the N. Imine's have hydrogens, an oxime has an OH, and a hydrazone has a NH2.