品 出 Some examples: Sesquiterpene Sesquiterpene, 0E和偶合数均可说明3,4，H5是反式关 Sesquiterpene Sesquiterpene 费装 A2 296 13.0 12.5 8.0 7.5 7.0 6.5 6.0 12.85 s OH-5 8.06 d J=7.9Hz H-2', 6' 7.58 m H-3', 4', 5' 6.94 s H-3 6.53 d J=1.9Hz H-8 6.23 d J=1.9Hz H-6 3 7 5 4' 1' 8 6 4 2 1 O OH O HO 白杨素 297 3 7 5 4' 1' 8 6 4 2 1 O OH O OH 13.0 12.5 8.0 7.5 7.0 6.5 12.82 s OH-5 7.96 d J=8.7Hz H-2', 6' 7.65 t J=8.3Hz H-7 7.13 d J=8.3Hz H-8 6.97 d J=8.7Hz H-3', 5' 6.90 s H-3 6.79 d J=8.3Hz H-6 5, 4'-Dihydroxyflavone 298 6.1 6.0 5.9 5.8 5.7 5.6 5.5 5.4 5.3 Chemical Shift (ppm) 4.0 3.9 3.8 3.7 10 5 9 6 8 7 12 3 11 4 2 O 1 CH3 15 OH CH3 14 H H H CH2 13 O 13a 13b 7 4 9 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 Chemical Shift (ppm) Chloroform-d Sesquiterpene Some examples: 299 2.5 2.0 1.5 1.0 Chemical Shift (ppm) 10 5 9 6 8 7 12 3 11 4 2 O 1 CH3 15 OH CH3 14 H H H CH2 13 O 15 14 3 5 8ax 12-ax 11b 8eq 12eq,11a Sesquiterpene 300 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 Chemical Shift (ppm) 5.3 4.0 3.9 3.8 3.7 3.6 5 4 10 3 11 12 7 6 8 9 O 1 2 H3C O 13 H3C 15 HO CH3 14 H H H H 4 7 7 4 9 9 Sesquiterpene NOE和偶合常数均可说明H-3, H-4, H-5都是反式关 系。 301 2.0 1.5 Chemical Shift (ppm) 5 4 10 3 11 12 7 6 8 9 O 1 2 H3C O 13 H3C 15 HO CH3 14 H H H H 7 8 9 10 5 6 11 12 3 4 CH3 H H H H H H O H 2 1 O CH3 H H H H HO H CH3 8e 2 5a 11e 8a 12e 14 12a,3a Sesquiterpene