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四、光谱学特性光谱分析方法的发展大大地推动了这类生物碱的研究,特别是质谱,在这类生物碱的结构测定中起到了极为重要的作用。由于石松类生物碱所含氢质子大多数为饱和烷烃型,它们的化学位移非常接近,难以解析,所以其~1HNMR谱提供的信息较少,只有δ值较大的及一些甲基信号容易识别。近年来~(13)CNMR谱的应用,在某种程度上大大补充了这一不足,但由于碳谱应用较晚,这方面的数据还比较有限,因此,本文仅就它们的紫外光谱,红外光谱、
Fourth, the spectral characteristics of the development of spectroscopic methods greatly promoted the research of such alkaloids, in particular, mass spectrometry, in the determination of the structure of such alkaloids has played an extremely important role. Since most of the hydrogen protons contained in the lyocell alkaloids are of the saturated alkane type, their chemical shifts are very close and difficult to interpret, so their 1HNMR spectra provide little information and only large δ values and some methyl signals are easily identifiable . In recent years, the application of ~ (13) CNMR spectrum has greatly supplemented this problem to a certain extent. However, due to the late application of the carbon spectrum, the data in this respect are still relatively limited. Therefore, only the ultraviolet spectrum, infrared spectrum,