“…Other secondary NH-containing systems have also been shown to undergo N -nitrosation. These include, in order of decreasing reporting frequency: amides, ureas, − carbamates, heteroamides, , hydroxylamines, , hydroxylamine ethers, hydrazines, , hydrazones, hydrazides, and guanidines. , In general, these systems are less used, and their reactivity is typically lower compared to secondary amines due to the weaker nucleophilic character of the NH moiety. Hydroxylamine- and hydrazine-type compounds are an exception as they are typically as nucleophilic as amines.…”