| http://www.w3.org/ns/prov#value | - The reduction can be carried out with hydrogen in the presence of a catalyst, such as palladium, platinum or nickel, at temperatures of 40??? to 90??? C., or by non-noble metals, such as tin or zinc, in the presence of an acid, preferably a mineral acid, such as, for example, hydrochloric acid or sulfuric acid, at temperatures of 10??? to 50??? C. Preferably, the reduction is carried out with sodi
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