Abstract
The iron guanidine catalyst shows extraordinary copolymerization activity towards lactide, glycolide, and ϵ-caprolactone, as reported by Sonja Herres-Pawlis, Moshe Kol, and co-workers in their Research Article (e202112853). Depending on the reaction temperature and the mode of monomer addition, it either forms up to pentablock copolymers in a highly defined way or promotes transesterifications to such a high degree that random copolymers are produced. Therefore, it is a rare example of a catalyst mastering both microstructures: ordered and chaotic.
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