title: Highly heteroselective ring-opening polymerization of racemic lactide initiated by divalent ytterbium complexes bearing amino bis(phenolate) ligands.
abstract: Polymerization of racemic lactide initiated by divalent ytterbium complexes supported by either dimethylamino-amino bis(phenolate) or methoxy-amino bis(phenolate) ligands proceeds rapidly at room temperature in a living fashion to give heterotactic polylactide with the racemic enchainment of monomer units P(r) ranging from 0.97-0.99.
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Yang
authors.forename: Zhu
authors.initials: Z
authors.lastname: Du
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Qi
authors.initials: Q
authors.lastname: Shen
mesh_terms: D018360:Crystallography, X-Ray; D004146:Dioxanes / Q000737:chemistry*; D062385:Hydroxybenzoates / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D058105:Polymerization; D013237:Stereoisomerism; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D004146:Dioxanes; D062385:Hydroxybenzoates; D008024:Ligands; D009942:Organometallic Compounds; C091880:dilactide; C017616:phenolic acid; D015018:Ytterbium