Abstract
The title compound oxalic acid is available in anhydrous and dihydrate forms and exhibits several features which have made it particularly attractive as a reagent in organic synthesis. Oxalic acid is a mild Brønsted acid, which finds application in the Beckmann reaction, [1] protection and deprotection of carbonyl compounds, [2-4] and various selective cleavage and hydrolytic reactions. It is frequently used as a mild acidic quench for a variety of reactions including oxidations. [5] Oxalic acid has also been used as an acidic agent in a number of condensation processes such as condensation of allylic alcohols with aromatic rings, [6] carbonyl compounds and hydrazines, [7] aromatic amines and aldehydes, [8] and it has been utilized as a bifunctional condensation partner in the synthesis of heterocyclic systems. [9]
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