A-Alkylazetidines werc: cleaved by riucleophilic reagents under moderate conditions to give the corresponding ;l-substitrited-propylaInines. The additions were subject to acid catalysis and also proceeded slowly under alkaline SNZ conditions. ... , I I he effects of ring strain and substituents on the reactivity of small heterocycles are of continuing interest. Although the four-membered nitrogen heterocycles had generally heen considered to lack entirely the well- ...