Myers D, White AJP, Forsyth CM, Bown M, Williams CK. Phosphasalen Indium Complexes Showing High Rates and Isoselectivities in rac-Lactide Polymerizations.
Angew Chem Int Ed Engl 2017;
56:5277-5282. [PMID:
28378455 PMCID:
PMC5434947 DOI:
10.1002/anie.201701745]
[Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 11/06/2022]
Abstract
Polylactide (PLA) is the leading bioderived polymer produced commercially by the metal-catalyzed ring-opening polymerization of lactide. Control over tacticity to produce stereoblock PLA, from rac-lactide improves thermal properties but is an outstanding challenge. Here, phosphasalen indium catalysts feature high rates (30±3 m-1 min-1 , THF, 298 K), high control, low loadings (0.2 mol %), and isoselectivity (Pi =0.92, THF, 258 K). Furthermore, the phosphasalen indium catalysts do not require any chiral additives.
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