<sup>13</sup>C-NMR. Spectra, Structure and Reactivity of Cyclic Oxocarbons
作者:Werner Städeli、Roger Hollenstein、Wolfgang Von Philipsborn
DOI:10.1002/hlca.19770600325
日期:1977.4.20
The structures of cyclic polyketones, their hydrates and reduction products were studied in different solvents by 13C-NMR. spectroscopy. In dimethylsulfoxide solution rhodizonic acid (1), croconic acid (2) and squaric acid (3) exhibit signal averaging. In anhydrous tetrahydrofuran 1 and 2 could be observed as non-dynamic species. The spontaneous reactions of dodecahydroxycyclohexane (5) and decahydroxycyclopentane
通过13 C-NMR研究了在不同溶剂中环状聚酮的结构,它们的水合物和还原产物。光谱学。在二甲亚砜溶液中,Rhodizonic acid (1),croconic acid (2)和方酸(3)显示信号平均。在无水四氢呋喃1和2中可以观察到非动态物种。十二羟基环己烷(5)和十羟基环戊烷('leuconic酸')(6)的自发反应并研究了环缩产物的形成顺序。可以清楚地识别出关键的中间体,这些中间体支持了先前提出的机制,该机制涉及苯甲酸类型的重排,然后进行脱羧和随后的氧化还原反应。