Zinc and aluminum complexes of chiral ligands: Synthesis, characterization and application to rac-lactide polymerization

Four novel chiral zinc and aluminum complexes L2Zn (1), L3Al (2), L′2Zn (3) and L'AlMe2 (4) [L= (S)-2-pyrrolal-1-phenylethylimine, L'= (S)-N-((2-pyrrolyl)methyl)-1-phenylethanamine were synthesized in moderate or good yield via simple synthetic routes and all of the complexes can be used as initiators to give the isotactic-rich polylactides.194