ChemInform Abstract: A C2‐Symmetric Chiral Bis‐Sulfoxide Ligand in a Rhodium‐Catalyzed Reaction: Asymmetric 1,4‐Addition of Sodium Tetraarylborates to Chromenones.

Abstract A newly synthesized chiral bis‐sulfoxide ligand, (R,R)‐1,2‐bis(tert‐butylsulfinyl)benzene is used in the Rh‐catalyzed asymmetric 1,4‐addition reaction of various arylboronic acids (IV) to electron‐deficient olefins giving adducts with high enantioselectivities.