Multiple Quantum Coherence NMR and its Application to Molecular Structure Study.

我们发展了利用多重量子相干的核磁共振方法，并将其应用于分子结构的研究。发展了多中继关联光谱技术，将一个自旋的单量子相干转移到远离四个键的其他自旋上。该方法适用于纤维低聚糖。发现这种方法对于分离每个单个糖单元是非常有用的。建立了双量子相干回波相关光谱技术。将该方法应用于聚乙烯醇，测定了不同立构规整性序列中的等效亚甲基质子。该方法的<^（13）C>版本也被用于测定聚环氧丙烷的立构规整性和鉴定聚丁二烯的顺式和反式单元。利用多重量子滤波器分离出双自旋系统。利用双量子滤波器实现了纯相位COSY。将COSY与三重量子滤波器应用于聚乙烯醇，以确定等效的亚甲基质子。

We developed the NMR method utilizing the multiple quantum coherence and applied it to the study of molecular structure. The multiple-relay correlation spectroscopy in which the single quantum coherence of a spin is transferred to other spins far apart four bonds was developed. This method was applied to cellooligosaccharides. It was found that this method is quite useful to separate out each single saccharide unit. Double quantum coherence echo correlated spectroscopy(DECSY) was developed. This method of 1H was applied to poly(vinyl alcohol) to determine equivalent methylene protons in the sequence of different stereoregularity. The <^(13)C> version of this method was also applied to the determination of stereoregularity of polypropylene oxide and the identification of cis and trans units of polybutadiene. Multiple quantum filter was utilized to separate out the two-spin system. Pure phase COSY became possible with double quantum filter. COSY with triple quantum filter was applied to poly (vinyl alcohol) to determine equivalent methylene protons.