Construction of a Bidentate Arsenic Ligand Library Starting from a Cyclooligoarsine

Abstract

Bidentate ligands are, needless to say, pivotal in organometallic chemistry. In contrast to phosphorus ligands, practical synthetic protocols for the arsenic analogues remain to be developed, resulting in a lack of bidentate arsenic ligands. Herein the methods that we have recently developed were applied for bidentate arsenic ligands whose frameworks are well known in phosphorus ligand systems such as dppe, dppp, dppf, xantphos, etc. The palladium dichloride complexes of the obtained ligands were synthesized and used for the Suzuki-Miyaura coupling reaction. Organoarsenic ligands that can be readily accessible are quite limited, while various phosphorus ones are commercially available. Herein bidentate arsenic ligands were synthesized via practical synthetic routes. In addition, the structures and catalytic activity of their palladium complexes were investigated.