Probing the Importance of the Hemilabile Site of Bis(phosphine) Monoxide Ligands in the Copper-Catalyzed Addition of Diethylzinc to <i>N</i>-Phosphinoylimines: Discovery of New Effective Chiral Ligands
作者:Isabelle Bonnaventure、André B. Charette
DOI:10.1021/jo800969x
日期:2008.8.1
hemilabile ligand Me-DuPHOS(O) 2 has proven to be a successful ligand for the copper-catalyzed addition of diethylzinc to N-phosphinoylimines. The corresponding α-chiral amines were obtained in high yields (80−98%) and enantiomeric ratios (19.0:1 to 99.0:1 er). Furthermore, this Cu•2 catalytic system has been shown to be effective in the addition of diethylzinc to nitroalkenes and in the reduction of β,β-disubstituted
Chemistry of the SO bond. 11—carbon-13 and oxygen-17 nuclear magnetic resonance studies of stereoisomerism in 1,3,2-dioxathiepanes
作者:Desmond G. Hellier、H. Glendon Liddy
DOI:10.1002/mrc.1260270503
日期:1989.5
investigated by 13C and 17O NMR spectroscopy. The effects of substituents on the conformational equilibria of the seven‐membered rings are discussed and compared with those for six‐membered ring sulphites.