Figure 3. Spectrum top to bottom, show the 1H-NMR spectra of SA (top), the crude product ASA (middle) and the final product, ASA (bottom). The cutout of the 1H-NMR spectra includes the regions where we find the methyl group (1.6-3.00 ppm) and the aromatic region (6.6-8.5 ppm)

From

Introducing NMR to Biomedical Laboratory Scientists through a Laboratory Exercise; Synthesis, Structure Determination and Quantization of Aspirin by Employing an 1H-NMR Bench Top Instrument

Marit Kristin Leiren, Signe Steinkopf

World Journal of Chemical Education. 2022, 10(1), 8-19 doi:10.12691/wjce-10-1-2