Three-membered heterocycles, including epoxides, oxaziridines and aziridines are prone to ring opening because of the high ring strain present in these small molecules. As a consequence, ring-opening reactions of small rings by radical rearrangement have received much attention recently (Scheme 1). 1 Ring opening of cyclopropanes 1 (Z=CR 1 R 2 ) and oxiranes (Z=O) via cyclopropylmethyl radicals 2 and 2-oxiranylmethyl radicals 2 (Z=O), ...