Author/Authors :
Li، نويسنده , , Yong and Feng، نويسنده , , Yu and He، نويسنده , , Yanmei and Chen، نويسنده , , Fei and Pan، نويسنده , , Jie and Fan، نويسنده , , Qing-Hua، نويسنده ,
Abstract :
A new type of supramolecular chiral phosphorus-based ligands was prepared from easily available monodentate ligands through complexation between dibenzylammonium salt and dibenzo[24]crown-8 macrocycle. Rhodium complexes with these supramolecular ligands were prepared, and the supramolecular bidentate ligand-containing catalyst has demonstrated better catalytic activity for all substrates, and higher enantioselectivity except for the ortho-substituted substrates than those obtained from the parent monodentate ligand in the asymmetric hydrogenation of α-dehydroamino acid esters.
Keywords :
Chiral phosphorous ligands , SELF-ASSEMBLY , Pseudorotaxane , asymmetric hydrogenation