Studies on the carbenium-iminium ions derived from N-methylmorpholine-N-oxide (NMMO)
作者:Thomas Rosenau、Antje Potthast、Paul Kosma
DOI:10.1016/j.tet.2003.11.015
日期:2004.1
carbenium-iminium ions, an exo-centered species 2 and a ring-centered form 3, are derived from the widely used oxidant and cellulose solvent N-methylmorpholine-N-oxide (1) by heterolytic degradation. 3 rearranges into 2 in the presence of water, in an endothermic, bimolecular reaction involving a highly organized transition state, which is the first example of a carbenium-iminium ion interconversion
通过异质降解从广泛使用的氧化剂和纤维素溶剂N-甲基吗啉-N-氧化物(1)衍生出两个exo -centered物种2和一个ring-centered 3的carbenium -iminium离子。3在存在水的情况下,在涉及高度组织化的过渡态的吸热,双分子反应中重新排列为2,这是碳-亚胺离子互变的第一个例子。通过包括捕获反应,同位素标记,动力学研究和DFT水平计算的组合方法研究了反应机理。