EPR Support for the Ketyl Radical-Anion “Triggered” [3,3]-Sigmatropic Rearrangement
作者:Eric J. Enholm、Merle A. Battiste、Maria Gallagher、Kelley M. Moran、Angelo Alberti、Maurizio Guerra、Dante Macciantelli
DOI:10.1021/jo0257748
日期:2002.9.1
New physical evidence to support a ketyl radical-anion mechanism for the [3,3]-sigmatropic rearrangement is presented. With use of EPR spectroscopy, spectra are observed that can be attributed to 8, an acyl radical-anion species resulting from a [3,3]-rearrangement; this also functions as a key intermediate in the process. The spectrum of an additional paramagnetic species resulting from further addition
提出了支持[3,3]-σ重排的酮基自由基阴离子机理的新物理证据。使用EPR光谱,观察到的光谱可归因于[3,3]重排产生的8种酰基自由基阴离子。这也是该过程的关键中间环节。还观察到由锡中心自由基进一步加至反应产物而产生的其他顺磁性物质的光谱。