Investigating the Reactivity of Radical Cations: Experimental and Computational Insights into the Reactions of Radical Cations with Alcohol and <i>p</i>-Toluene Sulfonamide Nucleophiles
作者:John M. Campbell、Hai-Chao Xu、Kevin D. Moeller
DOI:10.1021/ja307046j
日期:2012.11.7
reactivity of electrochemically generated radicalcations toward alcohol and p-toluene sulfonamide nucleophiles was directly investigated through competition experiments. Alcohol-trapping of the radicalcation is the kinetically favored pathway and is reversible. Trapping with the sulfonamide leads to the thermodynamic product. Both reaction pathways were investigated computationally with density functional
Intramolecular Anodic Olefin Coupling Reactions: Using Competition Studies to Probe the Mechanism of Oxidative Cyclization Reactions
作者:Hai-Chao Xu、Kevin D. Moeller
DOI:10.1021/ol100317t
日期:2010.4.16
A competition experiment was designed so that the relative rates of anodic cyclization reactions under various electrolysis conditions can be determined. Reactions with ketene dithioacetal and enol ether-based substrates that use lithium methoxide as a base were shown to proceed through radical cation intermediates that were trapped by a sulfonamide anion. Results for the oxidative coupling of a vinyl