作者:V. A. Golubev、V. D. Sen’
DOI:10.1134/s1070428010070146
日期:2010.7
been developed for the synthesis of 5,5-dimethyl-3-oxo-4,5-dihydro-3H-pyrrole 1-oxide via oxidation of 2,2,6,6-tetramethyl-4-oxopiperidine 1-oxyl with chlorine in aqueous sodium perchlorate and subsequent ring contraction in the resulting 2,2,6,6-tetramethyl-1,4-dioxopiperidinium perchlorate in dilute perchloric acid. The relative rates of proton exchange between the CH2 and CH groups in the title compound
已经开发了通过氧化2,2,6,6-四甲基-4-氧哌啶-1-酮来合成5,5-二甲基-3-氧代-4,5-二氢-3 H-吡咯1-氧化物的方法。在高氯酸钠水溶液中用氯来氧化羟基,随后在高氯酸稀溶液中得到的2,2,6,6-四甲基-1,4-二氧代哌啶鎓中的环收缩。通过D 2 O中的1 H NMR光谱确定标题化合物中CH 2和CH基团之间的质子交换的相对速率,并根据UV光谱对pH值的依赖性(p K a = 13.2)。