核磁共振现象自1946年被Pureell和Bloch发现以来,已有三十多年的历史,特别是在最近十年以来,从仪器的性能改进和应用方面都取得了很大的进展,已成为测定有机化合物结构不可缺少的有效手段。再加上紫外光谱、红外光谱、旋光光谱、圆二色谱、质谱和X光衍射等仪器的配合,使得有机化合物结构的 Since its discovery by Pureell and Bloch in 1946, the phenomenon of NMR has been in existence for more than three decades. In particular, great progress has been made in the performance improvement and application of instruments since the last decade, Compound structure is an indispensable and effective means. Coupled with UV spectroscopy, infrared spectroscopy, optical rotation spectroscopy, circular dichroism, mass spectrometry and X-ray diffraction and other equipment with the combination of organic compounds structure