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五十年代,核磁共振技术开始应用于化学中,显示了它的强大的生命力。六十年代,随着核磁共振在有机化学中的广泛应用,核磁共振技术的飞速发展,它的研究对象及应用范围也日益扩大。在有机化合物中,磁性核有 H~1,C~(13),F~(19),P~(31),N~(15),B~(11),……等。其中,H~1是最重要的,也是研究最多的,是有机分子的重要结构分析工具。此外,F~(19)及 P~(31)等在各有关实验室中也有很多研究。但是,对于组成有机分子骨架的碳原子说来,却有困难,因为 C~(12)的磁矩等于零,没有核磁共振现象。只有碳的一个同位素 C~(13)是有磁性的。因此,测C~(13)的核磁共振直接研究碳骨架的想法长期以来具有
In the fifties, nuclear magnetic resonance technology began to be used in chemistry, showing its strong vitality. In the 1960s, with the wide application of NMR in organic chemistry and the rapid development of NMR technology, its research object and application range are also expanding. In organic compounds, the magnetic nucleus has H ~ 1, C ~ (13), F ~ (19), P ~ (31), N ~ (15), B ~ (11) Among them, H ~ 1 is the most important, but also the most studied, is an important structural analysis of organic molecules tools. In addition, F ~ (19) and P ~ (31) in the relevant laboratories, there are many studies. However, there are difficulties in terms of the carbon atoms that make up the skeleton of the organic molecule because the magnetic moment of C 12 equals zero and there is no phenomenon of nuclear magnetic resonance. Only one carbon isotope C ~ (13) is magnetic. Therefore, the idea of directly studying the carbon skeleton by measuring C ~ (13) NMR has long been