Table 1. Chemical Shifts (δ, ppm) and Coupling Constants (J, Hz) of Aromatic Protons H-4–H-7 and H-4′–H-7′ in Compound 8c (Scheme 4) and Diazoketones 1a–d (Figure 1) in [D4]MeOH.
| compound | H-4 (J) | H-5 (J) | H-6 (J) | H-7 (J) | H-4′ (J) | H-5′ (J) | H-6′ (J) | H-7′ (J) |
|---|---|---|---|---|---|---|---|---|
| 8c [5(CH2),6(CO)] | 7.76 d (0.7) | 7.52 dd (8.0, 1.5) | 7.10 d (7.9) | 8.28 dd (8.0, 1.4) | 8.11 dd (8.0, 0.6) | 7.90 d (0.7) | ||
| 1a [5(N2),5(CO)] Isomer 4 | 8.24 d (1.4) | 8.01 dd (7.9, 1.7) | 7.39 d (7.9) | 8.08 d (1.8) | 7.93 dd (8.1, 1.9) | 7.34 d (8.1) | ||
| 1b [6(N2),5(CO)] Isomer 3 | 8.23 d (1.5) | 7.93 dd (7.9, 1.6) | 7.29 d (7.9) | 8.14 d (8.3) | 7.86 dd (8.2, 1.7) | 7.44 d (1.3) | ||
| 1c [5(N2),6(CO)] Isomer 1 ([D3]MeCN) | 8.09 d (0.5) | 7.73 dd (8.2, 1.8) | 7.20 dd (8.2, 0.7) | 8.07 dd (7.9, 0.8) | 7.92 dd (7.9, 1.4) | 7.56 dd (1.3, 0.8) | ||
| 1d [6(N2),6(CO)] Isomer 2 | 8.11 dd (8.1, 2.6) | 7.81 d (7.9) | 7.35 s | 8.06 dd (8.3, 2.5) | 7.63 d (7.4) | 7.22 s |