Reactivities comparison of Pd and Pt catalysts liganded by secondary oxide phosphines with norbornadiene and terminal alkynes using CAR experiments

摘要

Despite the similar reactivity of these Pd(II) and Pt(II) complexes in solution (same reaction products were obtained, noted in green box, scheme 1), SORI-CID spectra suggest that different "reactive intermediates" are involved in the gas-phase. For the Pd(II) complex, the formed structure is a carbopalladation adduct ion obtained via a Pd phenylethynile complex intermediate. This pathways involves the C-C bond formation between PhCCH and NBD occuring by an insertion/migration. In contrast, in the case of Pt(II) complex, the expected bicyclo [3.2.1] octadiene structure is obtained in the gas-phase.