Synthesis and characterization of strongly electron-donating bidentate phosphines containing imidazolin-2-ylidenamino substituents and their electron-rich nickel(0), palladium(II) and gold(I) chelate complexes

Phosphorus‐Containing Superbases: Recent Progress in the Chemistry of Electron‐Abundant Phosphines and Phosphazenes

“… IAPs of Dielmann et al., their use in SF 6 activation and the synthesis of a phosphorus dication. [ 9 , 86 , 87 , 88 , 94 , 95 ] …”

“…The desired product was isolated in a 93 % yield after deprotonation and the subsequent addition of PCl( i Pr) 2 . [94] …”

“…All bidentate phosphine ligands were successfully employed for the generation of electron‐rich gold(I), palladium(II) and nickel(0) chelate complexes. [94] …”

“…[95] Chelating IAPs 24-26 were also synthesized by the Dielmann group, whereas the phosphine moieties were either connected via a ferrocene, [9] a 1,3-bis(imidazolin-2-ylidenamino) propylene or a phenylene backbone (Scheme 10). [94] The 1,3-bis (imidazolin-2-ylidenamino)propylene group is built up from the respective dicarbene followed by the reaction with N 2 O and hydrochloric acid. The desired product was isolated in a 93 % yield after deprotonation and the subsequent addition of PCl (iPr) 2 .…”

“…The desired product was isolated in a 93 % yield after deprotonation and the subsequent addition of PCl (iPr) 2 . [94] The ferrocene backbone is easily incorporated by the reaction of H-NBiPr with a lithium base and the subsequent addition of bis(dichlorophosphino)ferrocene by which diphosphine 26 is isolated in a 81 % yield. [9] In contrast to that, and most likely due to steric repulsion, the analogous reaction of bis (dichlorophosphino)benzene with H-NIiPr as the base and nucleophile solely afforded the chloro-tris(NIiPr) intermediate.…”