GROUP 4 COMPLEXES OF AMINE TRIS(PHENOLATE) LIGANDS, RING-OPENING POLYMERIZATION OF CYCLIC ESTERS EMPLOYING SAME, AND POLYMERS AND BLOCK CO-POLYMERS OBTAINED THEREBY
申请人:Ramot at Tel-Aviv University Ltd.
公开号:US20240270902A1
公开(公告)日:2024-08-15
A family of organometallic complexes of zirconium and hafnium (or other group 4 metals) bound to amine tris(phenolate) ligands bearing at least one phenolate substituent which is aryl or heteroaryl, and uses of these complexes in a (e.g., sterocontrolled) polymerization of cyclic esters such as lactides are provided. Polyester-containing materials featuring defined stereochemical structures are also provided.
Regioselective Carbonylation of <i>trans</i>-Disubstituted Epoxides to β-Lactones: A Viable Entry into <i>syn</i>-Aldol-Type Products
作者:Michael Mulzer、Bryan T. Whiting、Geoffrey W. Coates
DOI:10.1021/ja405151n
日期:2013.7.31
reported for the regioselective carbonylation of trans-disubstituted epoxides to cis-β-lactones. The two catalysts display high and opposing selectivities, which generally are difficult to achieve for this class of epoxides. The resulting β-lactones are well-defined precursors for a wide variety of aldol-type compounds. Altogether, carbonylation of disubstituted epoxides is established as a viable and