CHCI3 Hc На H, Hh Hị Hd Не Hf Hp 7.7 7.6 7.5 7.4 7.3 7.2 7.1 4.0 3.9 3.8 1.6 1.5 Ha H; Hg CH3 He CH3. `Hf На 8 6 4 3 ppm Figure 1 500 MHz 'H NMR spectrum of racemic naproxen in CDCI,. The carboxylic acid proton does not appear in the spectrum. CHCI, appears at 7.26 ppm. Three regions in the spectrum have been expanded and shown as insets.

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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.