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The definite structural assignments of the reaction products could be made from their nmr spectra。Typical nmr spectraof the products are shown in Figure 1: the spectrum in Figure 1A can be assigned to that of 1,4-dihydropyridine, since it
shows only two kinds of olefinic hydrogens, while the spectrum in Fugure 1B can be attributed to that of 1,2-dihydropyridine containing a small amount of 1,4-isomer.
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houlu666(金币+5, 翻译EPI+1): 很好! 2011-03-01 12:23:13
反应产物的明确结构可以由他们的核磁共振光谱确定,产物的典型的核磁共振光谱如图1所示:图1a中的频谱可以确认为1,4-二氢吡啶,因为只显示两种烯烃氢,而在1B F图的频谱可以确定为1,2-二氢吡啶包含少量的1,4-异构体。
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