Salan ligands assembled around chiral bipyrrolidine: predetermination of chirality around octahedral Ti and Zr centres
作者:Ekaterina Sergeeva、Jacob Kopilov、Israel Goldberg、Moshe Kol
DOI:10.1039/b823176a
日期:——
The first synthesis of Salan ligands assembled around the chiral 2,2'-bipyrrolidine backbone is described; as chelation to a metal can only occur via specific faces of the two pyrrolidine nitrogens, these ligands lead to predetermined chirality at metal centres of octahedral titanium and zirconium complexes.
Mechanistic Insight into the Stereochemical Control of Lactide Polymerization by Salan–Aluminum Catalysts
作者:Konstantin Press、Israel Goldberg、Moshe Kol
DOI:10.1002/anie.201503111
日期:2015.12
Active catalysts for the polymerization of lactide were formed upon the addition of benzyl alcohol. Polymeryl exchange between enantiomorphous aluminum species had a dramatic effect on the tacticity of the poly(lactic acid) (PLA) in the polymerization of racemic lactide (rac‐LA): The enantiomerically pure catalyst of the nonsubstituted salan ligand led to isotactic PLA, and the racemic catalyst exhibited