Ngày tải lên :
07/11/2012, 15:49
... max nm (log ): 262 (4.1), 34 5 (4.0); IR maxKBr- cm–1 33 20 (OH), 1650 (C=O), 1615, 1515, 1450 (aromatic C=C), 136 0, 131 5, 1210, 1160, 1025; H-NMR (30 0 MHz, CD3OD) : 7 .37 (2H, s, H2', 6'), 6.40 ... H-6); 13C-NMR (75 MHz, CD3OD) : 147.2 (C-2), 135 .9 (C -3) , 176 .3 (C-4), 161.5 (C-5), 98.2 (C-6), 164.6 (C-7), 93. 4 (C-8), 157.2 (C-9), 1 03. 5 (C-10), 122.1 (C-1'), 107.5 (C-2', 6'), 145.7 (C -3' , 5'), ... Fraction (0 .3 g) was chromatographed over an RP-18 column using MeOH–H2O (1:2) as an eluting solvent to yield compound (32 mg) Compound 1: Bright yellow-green powder; mp 35 7 - 35 9oC; FeCl3 reaction:...