NMR assignment of absolute configuration of a P-chiral diphosphine and mechanics of its stereoselective formation

Template effects on the asymmetric cycloaddition reaction between 3,4-dimethyl-1-phenylarsole and diphenylvinylphosphine and their arsenic elimination reaction

“…For example, there is an internal steric repulsion between the methyl substituent on the stereogenic carbon and its neighboring naphthylene proton in complex (+)-1. The crystallographic determinations and rotating overhauser effect (ROESY) NMR investigations confirmed that the organometallic ring is locked into the static k conformation, both in the solid state and in solution [10]. Thus the prochiral NMe groups are fixed into the non-equivalent axial and equatorial positions.…”

Pd‐Catalyzed Enantiodivergent and Regiospecific phospha‐Michael Addition of Diphenylphosphine to 4‐oxo‐Enamides: Efficient Access to Chiral Phosphinocarboxamides and Their Analogues

“…It is known that the ( R )‐metallated naphthylphosphine ring in 4 preferentially adopts a δ absolute conformation, with the methyl substituent occupying the axial position and the two prochiral phenyls of the phosphorus projecting above and below the square plane (Figure 2, Ph eq , Ph ax ) 27. Notably, the latter plays a significant role in the stereoinducing ability of catalyst 4 .…”

Enantioselective, High‐Yielding Synthesis of Alcohol‐Functionalized Diphosphanes Utilizing Asymmetric Control with a Chiral Auxiliary

“…[8] The Pt1-P1 and Pt1-P2 distances are not significantly different [2.252(3) In order to confirm the structure of the cycloadduct in solution, a 500 MHz solution 2D 1 H-1 H ROESY NMR spectroscopic study of (R C ,S P )-6 was carried out in CD 2 Cl 2 . The resultant 2D ROESY NMR spectrum is shown in Figure 2.…”