Lactide cyclopolymerization kinetics, X-ray structure, and solution dynamics of (tBu-SalAmEE)Al and a cautionary tale of polymetalate formation

Solomon H. Reisberg, Harry J. Hurley, Robert T. Mathers, Joseph M. Tanski, Yutan D.Y.L. Getzler

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The complex (tBu-SalAmEE)Al (tBu-SalAmEEH3 = N,N-bis(3,5-di-tert-butyl-2-hydroxybenzyl)-2-(2-aminoethoxy)ethanol, 1) catalyzes the ring-expansion polymerization of lactide to form cyclic poly(lactide) (cPLA). The X-ray structure of 1 was determined, its polymerization kinetics were examined and its interactions with Lewis bases were observed. The data from these experiments are consistent with a coordination-insertion mechanism whose rate-determining step is catalyst rearrangement by loss of a hemilabile, datively bound, bridging ligand ether. cPLA was examined by thermogravimetric analysis and found more stable than its linear counterpart. In the course of these studies, we unexpectedly observed the formation of polymetalate (AlMe(tBu-SalAmEE)AlMe2) 2 (6), which was characterized (X-ray, EA, and 1H and 13C NMR).

Original languageEnglish (US)
Pages (from-to)3273-3279
Number of pages7
JournalMacromolecules
Volume46
Issue number9
DOIs
StatePublished - May 14 2013

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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