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- W3127859093 abstract "Abstract The N‐heterocyclic carbene‐phosphinidene adducts (NHC)PH were reacted with AlMe 3 in toluene to afford the monoaluminum complexes [{(IDipp)PH}AlMe 3 ] and [{(IMes)PH}AlMe 3 ] (IDipp=1,3‐bis(2,6‐diisopropylphenyl)imidazolin‐2‐ylidene, IMes=1,3‐bis(2,4,6‐trimethylphenyl)imidazolin‐2‐ylidene). In contrast, the dialuminum complex [{( Me IMes)PH}(AlMe 3 ) 2 ] was obtained for Me IMes=1,3‐bis(2,4,6‐trimethylphenyl)‐4,5‐dimethylimidazolin‐2‐ylidene. These complexes served as initiators for the efficient ring‐opening polymerization of rac ‐lactide in toluene at 60 °C. High degrees of isoselectivity were found for the poly( rac ‐lactide) obtained in the presence of the monoaluminum complexes ( P m up to 0.92, T m up to 191 °C), whereas almost atactic polymers were produced by the dialuminum complex. Detailed mechanistic studies reveal that the polymerization proceeds via a coordination‐insertion mechanism with the carbene‐phosphinidene ligands acting as stereodirecting groups." @default.
- W3127859093 created "2021-02-15" @default.
- W3127859093 creator A5034097375 @default.
- W3127859093 creator A5036558577 @default.
- W3127859093 creator A5047299792 @default.
- W3127859093 creator A5089595781 @default.
- W3127859093 date "2021-03-03" @default.
- W3127859093 modified "2023-09-30" @default.
- W3127859093 title "Isoselective Polymerization of <i>rac</i> ‐Lactide by Aluminum Complexes of N‐Heterocyclic Carbene‐Phosphinidene Adducts" @default.
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