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Grignard with nitrile: why is the imine protonated twice?

Chemistry Asked by Clara Li on December 14, 2021

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Steps 2 and 3 in the picture show the imine being protonated twice to form the iminium ion in step 4. I’m a little confused as to why the second protonation occurs; does the imine after step 2 still have basic tendencies?

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