The source of nitrogen in Gabriel synthesis of amines is :

Sodium azide, NaN3  Sodium nitrite, NaNO2 Potassium cyanide, KCN Potassium Phthalimide,C6H4(CO)2N-K+

Potassium Phthalimide,C6H4(CO)2N-K+

Source of nitrogen in Gabriel phthalimide synthesis is potassium phthalimide, C6H4(CO)2N-K+