Several functional groups containing nitrogen are considerably stronger bases than are ordinary amines. One is the amidine group found in DBN and DBU, both of which are widely used as bases in a variety of organic reactions. 

Another unusually strong organic base is guanidine, . 

Indicate which nitrogen in each of these bases is the one most likely to be protonated and explain the enhanced strength of these bases relative to simple amines

Transcribed Image Text:

Amidine 1,5-Diazabicyclo[4.3.0]non-5-ene (DBN) 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) group