Question

Interpret the 13C NMR of aspirin – assign as many signals as possible on the spectrum to the structure and report the appropriate expected chemical shift range of each carbon signal Assignments (B' – J') | Expected Chemical Shift Range (ppm) | Chemical Shift (Observed ppm) --- | --- | --- | | 169 & 170 | | 152 | | 125 – 135 (4 peaks) | | 122 | | 20 Results: 13C NMR spectrum (observed chemical shifts) Acetylsalicylic Acid (Aspirin) 170.17 169.86 solvent Figure 3. 13C NMR of Aspirin in CDCl3

          Interpret the 13C NMR of aspirin – assign as many signals as possible on the spectrum to the structure and report the appropriate expected chemical shift range of each carbon signal

Assignments (B' – J') | Expected Chemical Shift Range (ppm) | Chemical Shift (Observed ppm)
--- | --- | ---
 | | 169 & 170
 | | 152
 | | 125 – 135 (4 peaks)
 | | 122
 | | 20

Results: 13C NMR spectrum (observed chemical shifts)

Acetylsalicylic Acid (Aspirin)
170.17
169.86
solvent

Figure 3. 13C NMR of Aspirin in CDCl3

Interpret the 13C NMR of aspirin – assign as many signals as possible on the spectrum to the structure and report the appropriate expected chemical shift range of each carbon signal

Assignments (B' – J') | Expected Chemical Shift Range (ppm) | Chemical Shift (Observed ppm)
— | — | —
| | 169 170
| | 152
| | 125 – 135 (4 peaks)
| | 122
| | 20

Results: 13C NMR spectrum (observed chemical shifts)

Acetylsalicylic Acid (Aspirin)
170.17
169.86
solvent

Figure 3. 13C NMR of Aspirin in CDCl3

Added by James H.

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