Table 4.
Comparison of 13C NMR chemical shifts in thymine incubated in concentrated sulfuric acid for two different time periods. All NMR data were obtained at room temperature.
| Thymine | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 13C | ||||||||||
| Solvent | C2 (ppm) | C4 (ppm) | C5 (ppm) | C6 (ppm) | CH3 (ppm) | |||||
| 13 October 2022 | 7 November 2023 | 13 October 2022 | 7 November 2023 | 13 October 2022 | 7 November 2023 | 13 October 2022 | 7 November 2023 | 13 October 2022 | 7 November 2023 | |
| 81% D2SO4/19% D2O | 146.93 | 146.73 | 167.79 | 167.77 | 107.89 | 107.95 | 149.61 | 149.68 | 10.41 | 10.42 |
| 88% D2SO4/12% D2O | 148.27 | 148.17 | 167.88 | 167.87 | 107.68 | 107.68 | 149.18 | 149.21 | 10.26 | 10.26 |
| 94% D2SO4/6% D2O | 148.97 | 148.98 | 167.92 | 167.92 | 107.83 | 107.81 | 149.08 | 149.02 | 10.12 | 10.12 |
| 98% D2SO4/2% D2O | 148.95 | 148.95 | 167.98 | 167.97 | 108.09 | 108.07 | 149.59 | 149.51 | 9.99 | 10.00 |