New chiral monodentate phospholane ligands by highly stereoselective hydrophosphination

Distinct Reactivity of Mono- and Bis-NHC Silver Complexes: Carbene Donors versus Carbene–Halide Exchange Reagents

“…Oxidation with selenium failed for 4b , but 4a could be successfully oxidized ( 31 P NMR 53.5 ppm). The 31 P– 77 Se coupling constant of 765 Hz in selenido- 4a lies within the range reported for phospholane–selenides and indicates moderate σ basicity on phosphorus (compare 732 Hz for SePPh 3 ).…”

Synthesis of Josiphos-Type Bisphospholane Ligands

“…14 The 31 P-77 Se coupling constants for the bisselenides of L1 and L2 (Table 5) lie within the range reported for phospholane selenides (710-780 Hz). 15 The phosphorus atoms of L1 and L2 in the ortho position showed J Se,P = 713 and 718 Hz, respectively, similar to the value registered for the corresponding MeDuPhos derivative (712 Hz). The coupling constants of the phospholane selenides in the α-position are significantly higher (727 Hz for L1 and 726 Hz for L2) and closer to the value reported for Se=PPh 3 (732 Hz).…”

Synthesis and application of chiral monodentate phosphines in asymmetric hydrogenation

“…More recently, Börner et al reported a second type of monodentate phosphole, based on tartaric acid, which allowed easy integration of chiral information [22]. The key step was a double hydrophosphination (Scheme 10).…”

“…Immediately after, Börner et al reported a second type of monodentate phospholes, based on tartaric acid [22]. The obtained ligands were tested in the asymmetric hydrogenation of ␣-and ␤-dehydroamino acid derivates.…”