Diazetidines

Diazetidines are saturated four-membered rings with two nitrogen atoms. When the two nitrogen atoms are adjacent to each other, the heterocycle is referred to as 1,2-diazetidine, while a four-membered ring composed alternatively of carbon and nitrogen atoms is named 1,3-diazetidine. Such heterocycles might also sometimes be referred to as diazacyclobutanes.