Which mechanism step is not required for the following Gabriel synthesis?

Question

Quizplus · Accepted Answer

The Gabriel synthesis involves the formation of an alkylammonium salt by reacting potassium phthalimide with an alkyl halide, followed by treatment with a strong base to remove the phthalimide group and leave the desired primary amine. The nucleophilic addition of the alkyl halide to phthalimide and subsequent nucleophile elimination to form the alkylammonium salt, as well as proton transfer and elimination of the phthalimide group, are all necessary steps in the mechanism. However, there is no electrophile elimination step in the Gabriel synthesis.

Which Mechanism Step Is Not Required for the Following Gabriel