Characterization of polyphenols from plant materials through their silylation and29Si NMR spectroscopy—line assignment through29Si,13C spin-spin couplings
作者:Jan Schraml、Vratislav Blechta、Jan Sýkora、Ludmila Soukupová、Petra Cuřínová、David Proněk、Jaromír Lachman
DOI:10.1002/mrc.1638
日期:2005.10
The lines in 29Si NMR spectra of silylated polyphenols and some other compounds are difficult to assign owing to the absence of couplings with protons outside the silyl group. The assignment can be derived through small nJ(29Si, 13C) couplings (n > 1). Using a previously described method for measurements of these couplings, the assignment procedure is demonstrated here on three examples of trimethylsilylated
由于没有与甲硅烷基外的质子偶联,因此很难确定甲硅烷基化多酚和一些其他化合物的 29Si NMR 谱线。分配可以通过小的 nJ(29Si, 13C) 耦合 (n > 1) 得出。使用先前描述的方法测量这些偶联,这里展示了三甲基甲硅烷基化酚的三个例子的分配程序:7-羟基黄酮、阿魏酸和槲皮素。在某些情况下,该程序可用于识别与甲硅烷氧基相连的碳原子。版权所有 © 2005 John Wiley & Sons, Ltd.