A new platform for NCN dimethylamino pincer complexes: Synthesis and structural studies

Improved synthesis of pincer ligand precursor, and synthesis and structural characterization of terphenyl scaffolded S–C–S palladium pincer complex

“…Compound 2 had proved versatile in the formation of N-C-N and P-C-P pincer ligand precursors [6][7][8][9], and as expected, did so for an S-C-S analogue. Thus reaction of 2 and Li[S(p-Tol)] (freshly prepared by reaction of the thiol with nBuLi) readily yields compound 3 as a yellow oil in 87% yield (Scheme 3) [14].…”

“…Another attribute displayed is the great adaptability and variability of the ligand platform. Our recent efforts [6][7][8][9] have centered on a particular extension of one common pincer ligand motif, the meta-xylyl backbone (A, Chart 1). The introduction of additional aryl rings between the anchoring phenyl ring and the donor atoms forces the resulting pincer complexes (B, Chart 1) to be considerably non-planar owing to larger chelate ring sizes.…”

Canopied trans-chelating bis(N-heterocyclic carbene) ligand: synthesis, structure and catalysis

“…35 Protasiewicz et al has further utilized C-X bond activation of terphspan diphosphines, diphosphinites and bis(imines) to yield cyclometallated C 2 -symmetric terpincer ligands that are good candidates for asymmetric catalysis. [36][37][38] These promising initial data points suggest that the terphspan scaffold could be a worthy target for preparation of bis(NHC) complexes.…”