synthesis of chiralbisphosphines bearing a hydroxyl group in a rigid backbone is described. These compounds which are analogues of the prominent ligand DIOP formed definite rhodium complexes. IR spectra provided evidence that the hydroxyl groups do not participate in the complexation to the metal or to one of the acetal oxygen atoms. The complexes have proven successful in the asymmetric hydrogenation of prochiral
The selective and smooth introduction of sulfonate groups in chiral diphosphines by the reaction of hydroxy diphosphines with o-sulfobenzoic anhydride in the presence of Na2CO3 or n-butyl lithium, respectively, is described.
分别描述了在Na 2 CO 3或正丁基锂存在下,通过羟基二膦与邻磺基苯甲酸酐的反应,选择性和平稳地将磺酸酯基引入手性二膦中。