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Comparison of Selected 1H NMR Data for Diols 16a,b, 17a,b, and Callipeltins A (1) and D (2)
| compd | H-2 d, ppm (J, Hz) | H-3d, ppm (J, Hz) |
|---|---|---|
| 1 | 3.99 d (9.1) | 3.65 dd (9.1, 2.2) |
| 2 | 4.02 d (7.1) | 3.76 dd (7.1, 2.7) |
| 16a | 3.87 d (8.4) | 3.58 dd (8.5, 2.0) |
| 16b | 4.11 d (3.0) | 3.71 s |
| 17a | 3.87 d (8.5) | 3.58 dd (8.4, 1.9) |
| 17b | 4.11 d (3.8) | 3.71 d (3.7) |
