Two sets of cascade processes have been realized, both of which were initiated with a benzyne insertion into the Se═O bond. The key factors to differentiate these processes are based on the structures of diaryl selenium oxides and reaction conditions. When diaryl selenium oxides containing an weak σ-electron-withdrawing group were used, triarylselenonium salts were obtained at room temperature, while -(aryloxy)phenyl phenyl selanes could be produced from diaryl selenium oxides at 100 °C.
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