The homopolymers were further characterized by 1 H-NMR and GPC, the results of which is detailed in the supporting information (Fig. ) and Table . The polymerization was terminated with N-Boc-piperazine (PipBoc), wherein the Boc moiety yields a sharp and intense singlet in 1 H-NMR spectrum (Fig. ), facilitating end-group analysis. Based on this, p R EtEtOx, p S EtEtOx and p RS EtEtOx have a degree of polymerization (DP) of 21, 23, 21, respectively, while p R PrMeOx, p S PrMeOx and p RS PrMeOx have a DP of 22, 22 and 23, respectively. Both of pEtEtOx and pPrMeOx series are reasonably close to the targeted DP of 20 (from monomer to initiator ratio [M]0:[I]0), but it must be noted that all polymer signals are very broad and overlapping, making an accurate end-group analysis difficult. The dispersity as determined by GPC (Table , Fig. and) was very low with values ranging from Đ = 1.09-1.16. The molar mass obtained from GPC is considerably smaller than from end group analysis by H-NMR, which can be attributed to a different solution behaviour in the eluent compared to the utilized PEG-standards used for calibration in GPC. Besides, the pPrMeOx series was also characterized using another GPC system (chloroform as eluent), to elucidate the effects of eluent and calibration standard (Fig. ).