Hóa học - Dầu khí
... 9.61Hz, H -3) , 3. 31 (1H, d, J 9.98Hz, H-23a), 2.22 (1H, d, J 11 .27Hz, H -18 ), 1. 15 (3H, s, CH3-27), 1. 06 (3H, s, CH3-26), 0.98 (3H, s, CH3 -30 ), 0. 91 (3H, d, J 6. 93, CH3 -30 ), 0.87 (3H, s, CH3-26), ... (ppm): 5. 13 (1H, d, J 14 .6 Hz, H -12 ), 3. 40 (1H, dd, J 4.2Hz v 13 . 7Hz, H-2), 2. 73 (1H, d, J 9.3Hz, H -3) , 2 .10 (1H, d, J 11 .3Hz, H -18 ), 1. 03 (3H, s, 27-CH3), 0. 91 (3H, s, 27-CH3), 0.90 (3H, s, S ... max (cm -1) : 34 50, 2 936 , 16 90, 14 57, 13 8 5, 10 50 H-NMR (500 MHz, CDCl3-MeOD), (ppm):5.26 (1H, t, J 3. 46Hz, H- 12 ), 3. 72 (1H, dt, J 10 .48, 5.61Hz, H-2), 3. 53 (1H, d, J 11 .07Hz, H-23b), 3. 38 (1H, d,...