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【答案】应助回帖
hmily601(金币+50, 翻译EPI+1): 谢谢 辛苦你喽！！ 2011-12-12 00:13:29
According to the law of displacement for flavonoid O-glycoside daidzein glycosides…
According to the literature [3], the glycosides for hydroxyl of sugar occur will induce a low-field shift for the carbon atoms connected to –OH groups and the chemical shifts for C-6 of galactose was about 62.0ppm before glycoside. Based on the 12C-NMR of compound 1, it was shown that there were four chemical shifts namely 65.4, 66.9, 68.0 and 69.9 ppm. Such signal mentioned above was obviously in the low-field, which was changed to low-field by +4 to +6 units compared with the C-6 chemical shifts for galactose before glycosides. This might correspond to the signal of a 4.5 galactose C-6. According to the above analysis, it was confirmed that C-6 bits of 4.5 galactose had changed into glycosides.
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