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31P NMR chemical shift values for isoxazolidines 33, 34, 35 and 36.
| Nitrone |
δ31P NMR of isoxazolidine phosphonates (ppm) |
|||
|---|---|---|---|---|
| cis-33 | trans-34 | cis-35 | trans-36 | |
| 20a | 23.10 | 22.46 | 27.43 | 26.56 |
| 20b | 23.09 | 22.47 | 27.29 | 26.50 |
| 20c | 22.68 | 22.05 | 26.45 | 26.00 |
| 20d | 22.72 | 22.13 | 27.17 | 26.27 |
| 20e | 22.08 | 21.26 | 26.77 | 25.65 |
