Loss of Leaving Group

Loss of a leaving group – heterolytic bond cleavage, an atom or group takes the electron pair.

Take NoteThe leaving group takes the electrons of the bond with it.  A good leaving groups can handle the charge

 

More than one curved arrow may be needed to show the loss of a leaving group:

Only one arrow shows the Cl atom leaving.  The other arrows show resonance!  The electron density is pushed down from the NO2 to facilitate the loss of the leaving group.