Primary ketimines can be synthesized via a Grignard reaction with a nitrile. This method is known as Moureu-Mignonac ketimine synthesis.  For example, benzophenone imine can also be synthesized by addition of phenylmagnesium bromide to benzonitrile followed by careful hydrolysis (lest the imine be hydrolyzed):  
:CHCN  +  CHMgBr   →  (CH)C=NMgBr
:(CH)C=NMgBr  +  HO  →  (CH)C=NH  +  MgBr(OH)