When Bigger is Better: Lanthanum Complexes of Bis(phenoxy-amidine) FAlen Ligands as Unique Catalysts for the Isoselective Ring-Opening Polymerization of Racemic β-Lactones.

ABSTRACT: Discrete yttrium and lanthanum complexes supported by new bis(phenoxy-amidine) ligands have been prepared in high yields. Some of these so-called FAlen ligands, when coordinated onto the large La³⁺ in contrast to the small Y³⁺, can adopt an η³ coordination mode of both amidine moieties. These La-FAlen complexes, either previously isolated or conveniently prepared in situ, act as highly efficient ROP catalysts of simple and functional β-propiolactones rac-BL^R (R = Me, CH₂OiPr, CH₂OSitBuMe₂) under mild conditions, returning the corresponding linear polymers PBL^R with high control over the molecular weights and narrow dispersities. More uniquely, when substituents with appropriate bulkiness are installed o

SUBMITTER: Bui TT 

PROVIDER: S-EPMC12402878 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature