title: The first facile stereoselectivity switch in the polymerization of rac-lactide--from heteroselective to isoselective dialkylgallium alkoxides with the help of N-heterocyclic carbenes.
abstract: The reaction of N-heterocyclic carbene (NHC) with dimeric dialkylgallium alkoxides, acting as nonselective or heteroselective catalysts in the polymerization of rac-LA, leads to highly active and isoselective monomeric Me(2)Ga(NHC)OR catalysts, resulting for the first time in the facile switch of stereoselectivity.
authors.affiliation: Faculty of Chemistry, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland. horeglad@chem.uw.edu.pl
authors.forename: Paweł
authors.initials: P
authors.lastname: Horeglad
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Szczepaniak
authors.forename: Maciej
authors.initials: M
authors.lastname: Dranka
authors.forename: Janusz
authors.initials: J
authors.lastname: Zachara
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D004146:Dioxanes / Q000737:chemistry*; D005708:Gallium / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D058105:Polymerization; D013237:Stereoisomerism; D013379:Substrate Specificity
chemical_list: D000438:Alcohols; D004146:Dioxanes; D006571:Heterocyclic Compounds; C030011:carbene; C091880:dilactide; D005708:Gallium; D009584:Nitrogen; D008697:Methane