Ngày tải lên :
07/06/2016, 23:44
... inoxanthone (3) and Carbon no 3dC 4a 8a 9a 8b 10 20 30 156.7 105.5 159 .4 113.1 153.9 120.5 1 24. 2 116.03 181.3 144 .1 119.6 103.6 145 .3 41 .3 155.8 1 04. 0 5.06 (1H, dd, J = 1, 10) 28.2 28.2 78 .4 127.3 116.01 ... (calcd 379.1 544 for C23H23O5) IR m(cmÀ1, KBr): 345 8, 3293, 2960, 2920, 1 646 , 1620, 1585 UV k (nm, MeOH) (loge): 237 (4. 35), 249 sh, 280sh, 292 (5.65), 310sh, 340 sh, 376 (3.63) 1H NMR (40 0 MHz, CDCl3), ... (1H, dd, J = 10 and 17 Hz), d = 5.18/d = 1 04. 0 (1H, dd, J = and 17 Hz), and d = 5.06/d = 1 04. 0 (1H, dd, J = and 10 Hz) and a sixproton singlet at d = 1. 64/ d = 28.2 (6H, s), established the presence...