Phosphine-NHC-Phosphonium Ylide Pincer Ligand: Complexation with Pd(II) and Unconventional P-Coordination of the Ylide Moiety

Impact of the Methylene Bridge Substitution in Chelating NHC‐Phosphine Mn(I) Catalyst for Ketone Hydrogenation

“…The attempted deprotonation of a priori less acidic complex 4 a with KHMDS under the same conditions led to a complicated mixture of products according to IR and 31 P NMR data probably due to extensive decomposition of the resulting product. Similar trend was recently observed in the deprotonation of Pd(II) complexes bearing CH 2 ‐ and C(H)Ph‐bridged NHC‐phosphine fragments [46] …”

“…Similar trend was recently observed in the deprotonation of Pd(II) complexes bearing CH 2 -and C(H)Ph-bridged NHCphosphine fragments. [46] Gratifyingly, the use of a stronger base such as LiNiPr 2 (LDA) for the deprotonation of 4 e led to a quasi-quantitative formation of the anionic complex Li[7 e] (Figure 3). While the key 1 H and 31 P NMR characteristics were found to be similar for those of K[7 e], the IR spectrum of Li[7 e] is quite different showing ca.…”

Design and synthesis of versatile ligand precursors based on phosphonium ylides for palladalactam formation and catalytic investigation

“…Transition metal complexes involving phosphonium ylides have been attracting interest over several decades. 1–16 Recently, Gessner et al introduced a pioneering class of palladium complexes featuring ylide-functionalized phosphine ligands known as YPhos (Fig. 1).…”