New Kids in Lactide Polymerization: Highly Active and Robust Iron Guanidine Complexes as Superior Catalysts

ChemSusChem
Ruth D RittinghausSonja Herres-Pawlis

Abstract

Polylactide is a biodegradable versatile material based on annually renewable resources and thus CO2 -neutral in its lifecycle. Until now, tin(II)octanoate [Sn(Oct2 )] was used as catalyst for the industrial ring-opening polymerization of lactide in spite of its cytotoxicity. On the way towards a sustainable catalyst, three iron(II) hybrid guanidine complexes were investigated concerning their molecular structure and applied to the ring-opening polymerization of lactide. The complexes could polymerize unpurified technical-grade rac-lactide as well as recrystallized l-lactide to long-chain polylactide in bulk with monomer/initiator ratios of more than 5000:1 in a controlled manner following the coordination-insertion mechanism. For the first time, a biocompatible complex has surpassed Sn(Oct)2 in its polymerization activity under industrially relevant conditions.

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Citations

Oct 7, 2019·Chemistry : a European Journal·Ruth D RittinghausSonja Herres-Pawlis
Sep 29, 2019·ChemSusChem·Salvatore ImpembaStefano Milione
Sep 14, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Oliver J DriscollMatthew D Jones
Dec 13, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Swarup GhoshStephan Schulz
Jul 17, 2021·Angewandte Chemie·Ruth D RittinghausSonja Herres-Pawlis

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