Abstract

Cat. at rest: [{IrCp*Cl2}2] readily catalyzes the redox cyclization of nitron alkynes (e.g., 1) to give azomethine ylides that can then react with electrophiles and π bonds. The unusual O-bound azomethine complex 2 was isolated and identified as the resting state of the catalyst in the azomethine ylide formation. Cp*=C5Me5.

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