Radical Cation-induced 4 + 2 and 2 + 2 Cycloadditions Initiated by Iron(III) Salts

摘要

Aromatic radical cation is a labile intermediate that appears in various one-electron oxidation reactions. Despite the utility of such reactions, direct observation and isolation of radical cations have been less studied because of their high reactivities and short lifetimes. Here, we isolated a stable radical cation–anion 2 generated from iron(III) chloride (FeCl ) with sterically congested arene 1. With the aromatic radical cation