[e] at room temperature. See Supporting Information for additional conditions tested. A variety of allyl electrophiles have been used as precursors to palladium π-allyl species. The ethyl carbonate and Boc moieties were chosen empirically for optimization (Table and Scheme 3, Entries ). An examination of other leaving groups, including acetate (Scheme 3, Entry 3), benzoate (Scheme 3, Entry 4), and 2,2,2-trichloroethyl carbonate (Scheme 3, Entry 5), showed that none were superior to ethyl carbonate. Thus, for exploration of the substrate scope, ethyl carbonate was retained as the leaving group.