New dialkylenetriamine zinc complexes as highly efficient ROP catalysts

Diamidoamine Aluminum Complexes: Synthesis, Structure, L–Lactide and ϵ‐Caprolactone Polymerization

“…Ligands 1 MeN(CH 2 CH 2 NHC 6 F 5 ) 2 , [3] 2 PhCH 2 N(CH 2 CH 2 NHC 6 F 5 ) 2 , [28] 3 MeN(CH 2 CH 2 CH 2 NHC 6 F 5 )(CH 2 CH 2 NHC 6 F 5 ) [29] were synthesized according to the literature procedures, whereas 4 MeN(CH 2 CH 2 CH 2 NHC 6 F 5 ) 2 and 5 BnN(CH 2 CH 2 CH 2 NHC 6 F 5 ) 2 are novel and were synthesized by two step synthesis similar to those reported for 1 – 3 (Scheme 1). Ligands 4 and 5 are yellowish oils and were purified by column chromatography.…”

Metal Complexes in the Synthesis of Biodegradable Polymers: Achievements and Prospects

“…lactide and glycolide, respectively, with respect to the catalyst, a polymer with M n = 39,400 and Ð = 1.7 was obtained after 140 min [99]. In search of new active initiators, the authors of [100] chose zinc derivatives based on dialkylenetriamines, which contain C 6 F 5 , providing both steric protection and an increase in the positive charge on the zinc atom due to their acceptor properties. To determine the possibility of using the resulting complexes in ROP, compounds 101 and 103, which have different lengths of carbon chains in the ligand structure, were tested in polymerizations of ε-CL and trimethylene carbonate (TMC).…”

Diamidoamine Aluminum Complex as Effective Initiator for Random Copolymerization of Substituted Carbonate with L-Lactide

“…The overly sterically hindered ligands can reduce the accessibility of the catalytic center, thereby slowing the polymerization process. While selecting suitable ligands, we have focused on dialkylenetriamines that have been used previously for the preparation of the metal complexes, including Al and Zn, which have shown promising results in the ROP of lactides and ε-caprolactone (ε-CL) …”