Green Chemistry p. 3238 - 3242 (2017)
Update date:2022-08-11
Topics:
Rashed, Md. N.
Siddiki
Ali, Md. A.
Moromi, Sondomoyee K.
Touchy, Abeda S.
Kon, Kenichi
Toyao, Takashi
Shimizu, Ken-Ichi
Cyclic anhydrides, key intermediates of carbon-neutral and biodegradable polyesters, are currently produced from biomass-derived dicarboxylic acids by a high-cost multistep process. We present a new high-yielding process for the direct intramolecular dehydration of dicarboxylic acids using a reusable heterogeneous Lewis acid catalyst, Nb2O5·nH2O. Various dicarboxylic acids, which can be produced by a biorefinery process, are transformed into the corresponding cyclic anhydrides as monomers for polyester production. This method is suitable for the production of renewable polyesters in a biorefinery process.
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