Dual catalysis for selective ring-opening polymerization of lactones: evolution toward simplicity

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From: Journal of the American Chemical Society(Vol. 137, Issue 45)
Publisher: American Chemical Society
Document Type: Report
Length: 97 words

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Abstract :

The article demonstrates that the combination of N-heterocyclic carbenes, 1,8-diazabicycloundec-7-ene (DBU) and 4-dimethylaminopyridine (DMAP) with simple Lewis acids enables the ring-opening polymerization (ROP) of the macrolactone pentadecalactone in a rapid and efficient manner. Surprisingly, regardless of the nature of the nucleophile, the order of activity is observed to be Mg[X.sub.2] ? Y[Cl.sub.3]? Al[Cl.sub.3] and Mg[I.sub.2] Mg[Br.sub.2] Mg[Cl.sub.2] in every case. Moreover, extension of the study to other cyclic (di)ester monomers makes known the choice of Lewis acid to lead to monomer selective ROP activity and hence control over copolymer composition by choice of Lewis acid.

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Gale Document Number: GALE|A438198060