Synthesis and application of novel ionic phosphine ligands with a cobaltocenium backbone

Six novel ionic phosphine ligands with a cobaltocenium backbone, 1,1′-bis(dicyclohexylphosphino) cobaltocenium hexafluorophosphate (di-cypc+PF6-) (1a), 1,1′-bis(di-iso  -propylphosphino) cobaltocenium hexafluorophosphate (di-isoppc+PF6-) (2a), 1,1′-bis(di-tert  -butylphosphino) cobaltocenium hexafluorophosphate (di-tbpc+PF6-) (3a), and the monophosphine ligand Cc+PR2PF6- (Cc+ = cobaltocenium; R = Cy, 1b; R = i-Pr, 2b; R = t-Bu, 3b) were synthesized and characterized by elemental analysis, spectroscopy, and X-ray diffraction techniques. These ligands are air-stable and useful for Suzuki coupling reactions in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM+PF6-), enabling high catalytic activity.

Six novel ionic phosphine ligands with cobaltocenium backbone were synthesized and characterized by X-ray diffraction techniques. These ligands were proved to be air-stable and suitable for Suzuki coupling reaction in ionic liquid (BMIM+PF6-), enabling high catalytic activity.Figure optionsDownload as PowerPoint slide