Well-Defined Calcium Initiators for Lactide Polymerization
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- 24 September 2004
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 43 (21) , 6717-6725
- https://doi.org/10.1021/ic0490730
Abstract
A series of monomeric amide or aryloxide complexes of the form LCaX, where L = CH[CMeNC6H3-2,6- ]2, CH[CMeNC6H4-2-OMe]2, a bulky tris-pyrazolyl borate, TpiPr or TptBu or 9-BBN-pz2 and X = N(SiMe3)2 or OC6H3-2,6- , has been prepared and characterized and investigated in the ring-opening polymerizations of lactide. The compounds (TptBu)CaX in THF are shown to be highly active and stereoselective. The propylene oxide complex (TptBu)Ca(OC6H3-2,6- )·(PO) has been isolated and structurally characterized (single-crystal X-ray) and shown to be inert to the polymerization of PO.Keywords
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