ملخص: The reaction between trans-PhPdI(PPh3)2 and EtO2C-CCH has been investigated. This carbopalladation step involved in palladium-catalyzed multicomponent reactions with alkynes gives the unusual trans-adduct EtO2C-C(PdIL2)CHPh 1 as the major complex formed by isomerization of the primary cis-adduct EtO2C-C(PdIL2)CHPh 2. The carbopalladation was regiospecific. A multicarbopalladation was also observed by successive carbopalladation of EtO2C-CCH by the vinyl-palladium complexes themselves generated in carbopalladation steps, leading to cationic complexes.

لغة: إنجليزية