Ibuprofen Aldehyde Impurity, CAS 51407-46-6, is an aromatic aldehydic process-related impurity structurally derived from the isobutylphenyl propionic acid scaffold of ibuprofen. Its molecular formula, C13H18O, and molecular weight, 190.28 g/mol, indicate a reduced functionality relative to the parent acid, consistent with oxidative side-chain transformation or incomplete synthetic conversion. The aldehyde moiety is chemically reactive and may participate in further oxidation to the corresponding acid or in Schiff base formation. Characterization generally requires orthogonal chromatography with LC-MS/MS or GC-MS, often complemented by NMR to confirm the carbonyl environment and positional identity.
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