Bimetallic polymerization of lactide with binaphthol-derived bis-heteroscorpionate dizinc and dimagnesium complexes

Abstract

Discrete bimetallic catalysts often provide enhanced reactivity and selectivity in lactone polymerization, making metal-metal cooperativity an important design principle for new catalyst development. However, the poor modularity of binucleating ligands...

Cooperative effects of Schiff base binuclear zinc complexes on the synthesis of aliphatic and semi-aromatic polyesters

“…Noteworthily, binuclear zinc complexes often show higher activity or peculiar catalytic behaviors compared to their monometallic counterparts, thanks to the synergistic interactions between zinc atoms. 17–19 The most relevant examples of di-zinc complexes reported in the literature are supported by phenoxy-based ancillary ligands both for the ROP of lactide 20–30 and ε-caprolactone 31–35 and for the ROCOP of epoxides and cyclic anhydrides. 35–39…”

“…Noteworthily, binuclear zinc complexes often show higher activity or peculiar catalytic behaviors compared to their monometallic counterparts, thanks to the synergistic interactions between zinc atoms. [17][18][19] The most relevant examples of dizinc complexes reported in the literature are supported by phenoxy-based ancillary ligands both for the ROP of lactide [20][21][22][23][24][25][26][27][28][29][30] and ε-caprolactone [31][32][33][34][35] and for the ROCOP of epoxides and cyclic anhydrides. [35][36][37][38][39] As part of our research interest in zinc complexes in the ROP of cyclic esters, [40][41][42][43][44] we recently reported di-nuclear zinc complexes supported by properly designed bis(imino-pyridine) binaphthol ligands.…”