Well, diazonium salts would indeed be formed upon nitrosation from primary, unprotected amino groups. Secondary amines yield N-nitroso amines (at 7.02 min above), and amides/sulfonamides/ureas/carbamates sometimes are nitrosated, sometimes not, depending on the conditions.
Interesting that diazonium formation doesn't occur with some of those nitrosations
Well, diazonium salts would indeed be formed upon nitrosation from primary, unprotected amino groups. Secondary amines yield N-nitroso amines (at 7.02 min above), and amides/sulfonamides/ureas/carbamates sometimes are nitrosated, sometimes not, depending on the conditions.