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Table 1 1H (600 MHz), 13C NMR (150 MHz) and HMBC data for compound 1 in DMSO-d6

From: A pair of new enantiomers of xanthones from the stems and leaves of Cratoxylum cochinchinense

Position 1H-NMR (mult, J in Hz) 13C–NMR HMBC (1H → 13C)
1   158.0  
2   108.0  
3   163.5  
4   106.3  
5 7.46 (1H, d, J = 9.0 Hz) 118.6 C-7, 8a, 10a
6 7.28 (1H, dd, J = 9.0, 3.0 Hz) 124.4 C-8, 10a
7   153.8  
8 7.40 (1H, d, J = 3.0 Hz) 107.9 C-6, 9, 10a
9   179.9  
4a   152.9  
8a   120.1  
9a   101.5  
10a   149.0  
1′ 2.95 (1H, dd, J = 14.7, 3.1 Hz)
2.82 (1H, dd, J = 14.7, 8.0 Hz)
28.9 C-1, 2, 3, 2′, 3′
2′ 4.24 (1H, dd, J = 8.0, 2.3 Hz) 74.8 C-2, 1′, 3′
3′   147.1  
4′ 4.89 and 4.75 (each 1H, s) 110.0 C-2′, 3′, 5′
5′ 1.76 (3H, s) 18.1 C-2′, 3′, 4′
1″ 3.43 (2H, d, J = 7.2 Hz) 21.6 C-3, 4, 4a, 2″, 3″
2″ 5.19 (1H, t, J = 7.2 Hz) 122.5 C-1″, 4″, 5″
3″   130.6  
4″ 1.82 (3H, s) 17.8 C-2″, 3″, 5″
5″ 1.62 (3H, s) 25.6 C-2″, 3″
1-OH 13.35 (1H, s)   C-1, 2, 9a
7-OH 9.95 (1H, s)   C-6, 7, 8