ESI-MS Studies on the Mechanism of Pd(0)-Catalyzed Three-Component Tandem Double Addition-Cyclization Reaction

Four cationic palladium intermediates have been characterized by the high-resolution ESI−FTMS technology, on the basis of which a mechanism was proposed for the Pd(0)-catalyzed three-component tandem double addition cyclization of organic halides, 2-(2,3-allenyl)malonates, and imines.