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We determined the D/H isotope ratios of some ibuprofen and naproxen samples by 2 H NMR spectroscopy. Some of these values were found to be useful for collecting hints on the synthetic procedures employed to prepare these drugs. Site-specific isotope ratio analysis shows great potentials in the fight against patent infringement.
Samples of fluoxetine of different origin were submitted to natural abundance 2 H NMR spectroscopy. The deuterium content at the various sites of the molecule was found to depend on its synthetic history. Hints on the synthetic procedure can be obtained by comparison with standard compounds, whose synthesis is known. These preliminary results give an idea of the potential of site-specific...
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