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合成２对缩酮非对映异构体，测定它们的１３ＣＮＭＲ，计算２组１３Ｃ谱图中化学位移不等性碳原子信号相对强度所反映的非对映异构体组成，发现对于组成确定的各对非对映异构体中，各个具有化学位移不等性的碳原子信号强度所反映的非对映异构体组成存在较大偏差，初步探讨了１３ＣＮＭＲ作为非对映异构体组成分析方法的定量误差。
Two pairs of ketal diastereomers were synthesized and their 13CNMR values were determined. The diastereomeric composition as reflected by the relative intensities of the chemical shifts in the two C 13 C spectra was calculated and it was found that for the compositionally defined In each pair of diastereoisomers, the diastereomer compositions reflected by the signal intensity of each carbon atom with chemical shift inequality have large deviations, and the 13CNMR as the diastereomer composition analysis The quantitative error of the method.