“…Perfluoroalkyl iodides or a,v-diiodoperfluoroalkanes act as efficient chain transfer agents (CTA), since they easily undergo CF 2 -I bond cleavage [5,6,9,11,12,14,15,[20][21][22] leading to low molecular weight molecules. Most studies on the direction of addition of the telogen onto the asymmetric monomer (VDF) have shown that the addition mainly occurs onto the methylene groups of VDF [11,15,[20][21][22][23][24][25][26][27], and that it is regioselective. The stepwise telomerizations of VDF and HFP with perfluoroalkyl iodides or a,v-diiodoperfluoroalkanes acting as CTAs have been investigated [15,21,28].…”