Research Article
Study of Catalytic Hydrogenation and Methanol Addition to α-Methylene-γ-Lactone of Eremanthine Derivatives
Table 1
Selected chemical shifts for the hydrogens and carbons of compounds 20, 22, 23, 26, 27, 8a and 8c.
| Compound | Hydrogens [δ (Multiplicity, J/Hz)] | (sp2) δ | (sp3) δ (Position) | H-5 | H-6 | H-9 | H-13 | H-14 | H-15 |
| | 3.57 (m) | 4.14 (t, 10.0) | 4.50–4.20 (m) | 1.30–1.00 (m) | 1.86 (sl) | 5.40–5.30 (m) | 144.00 | 89.98 (C-6) | | 2.89 (m) | 4.05–3.85 (m) | | | 1.81 (sl) | 1.30–1.00 (m) | 138.25 | 86.49 (C-6) | | 2.63 (m) | 4.04 (t, 9.2) | | | 1.69 (sl) | | 131.25 | 86.28 (C-6) | 20, 22, 23, | 2.50 (m) | 3.81 (t, 9.5) | | | 0.91 (d, 7.1) | | | 85.85 (C-6) | 26, 27, 8c | | 3.65 (m) | | | | | | 83.10 (C-6) | | | | | | | | | 83.00 (C-6) | | | | | | | | | 77.64 (C-9) | | | | | | | | | 77.00 (C-9) | | | | | | | | | 73.67 (C-9) |
| 8a | — | 3.72 (dd, 9.7, 9.9) | — | 1.14 (d, 6.9) | 0.91 (d, 7.1) | 1.09 (d, 6.4) | 182.15 | 89.07 (C-6) |
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