Ngày tải lên :
25/03/2014, 12:21
... R1=R2=R3=COCH3 6, 88 s 7, 16 d 7 , 63 dd 7,72 d 6, 88 s 7, 16 d 7 , 63 dd 7, 73 d 7 ,02 s 7, 30 d 7,72 dd 7, 80 d 6, 97 s 7, 36 d 7 ,66 dd 7,78 d R =R =(CH3)NCO; R =OH 6 , 53 s 7, 23 d 7 ,66 dd 7, 75 d R1=R2=R3=CH3 6, 75 ... EA-hexan Tnc = 93 - 95C; IR (KBr), (cm-1): 29 26, 1 757 , 16 30 , 16 10, 1 469 , 1 36 3 , 1224, 109 6, 8 20; 1H-NMR( CDCl3), (ppm): 7, 73 (1H,d), 7 , 63 (1H,dd),7, 16 (1H,d), 6, 88 (1H,s), 3, 93 (3H,s), 3, 90 (3H,s), 3, 79 ... 12, 60 (1H,s), 7, 75 (1H,d), 7 ,66 (1Hdd), 7, 23 (1H,d), 6 , 53 (1H,s), 3, 93 (3H,s), 3, 92 (3H,s), 3, 85 (3H,s), 3, 18 (3H,s), 3, 15 (3H,s), 3 ,04 (6H,s) Tổng hợp d n xuất ete chất Chất 5: 4' ,5, 6- trihexanoyl -3, 3,7-trimetoxyflavon:...