Cyclopropanecarboxylic acid, CAS 1759-53-1, is a low-molecular-weight alicyclic carboxylic acid with formula C4H6O2 and molecular weight 86.09 g/mol. As a structural impurity, it may arise from cyclopropyl intermediates, hydrolytic cleavage, or incomplete carboxylation steps during synthesis of related drug substances and intermediates. Its strained three-membered ring and acidic functionality influence volatility, chromatographic behavior, and derivatization response. Because concentrations are typically trace level, determination often requires GC-MS or LC-MS/MS, frequently with selective ion monitoring. It is not a recognized genotoxic impurity class, but its occurrence should be evaluated within impurity profiling and process understanding frameworks.
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