Abstract
The heterogeneously catalyzed dehydroxylation of mucic acid to produce adipic acid, a highly relevant polymer precursor, was investigated. The use of methanol as solvent is particularly important since it not only acts as reducing agent but also protects the carboxylic acid functionality by esterification. Re/C was found a well-suited catalyst for this reaction and not only showed high activity but was also reusable with suitable reactivation procedure. Under optimized reaction conditions, 98 % of dehydroxylated products could be obtained from mucic acid. Moreover, combining Re/C with a suitable hydrogenation catalyst (e.g. Pd/C) and performing the reaction under H2 atmosphere steers the reaction towards adipic acid ester. Therefore, it could be shown that adipic acid derivatives are available from biomass-accessible mucic by this novel and renewable approach.
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