Abstract:
Cerium salt exhibited a highest catalytic activity in the conversion of ethyl and isopropyl oligolactates into lactide. A maximum yield of the target product was reached at the concentration of CeCl3·7H2O ranging from 1 to 4 mol% relative to the lactide units in ethyl and isopropyl oligolactates. A gradual reduction of the pressure from 50 to 5 Torr along with the temperature increase from 180 to 230°C during depolymerization resulted in the product containing up to 94% lactide.
Citation:
T. A. Egiazaryan, V. M. Makarov, M. V. Moskalev, D. A. Razborov, I. L. Fedushkin, “Synthesis of lactide from alkyl lactates catalyzed by lanthanide salts”, Mendeleev Commun., 29:6 (2019), 648–650
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https://www.mathnet.ru/eng/mendc1617
https://www.mathnet.ru/eng/mendc/v29/i6/p648
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