Discrete, Base-Free, Cationic Alkaline-Earth Complexes – Access and Catalytic Activity in the Polymerization of Lactide

✍ Scribed by Yann Sarazin; Valentin Poirier; Thierry Roisnel; Jean-François Carpentier

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 352 KB
• Volume: 2010
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.201000558

✦ Synopsis

Abstract

Well‐defined, base free cations of zinc and the alkaline‐earth metals (Mg, Ca, Sr, Ba) supported by a multidentate phenolate ligand and stabilized by perfluorinated weakly coordinating counterions are readily available by simple procedures; the solid‐state structures of the magnesium and calcium derivatives were elucidated. Upon treatment with an excess of __i__PrOH, these complexes generate highly efficient binary catalytic systems for the immortal ring‐opening polymerization of L‐lactide, yielding poly(L‐lactide)s with controlled architectures and molecular features.