Preparation of Dipyridylmethane Ligands with Pseudo-C2 Symmetry. Grafting on Polystyrenes via Transformation to Phenolic Derivatives

Article abstract of DOI:10.1021/jo00111a038

Efficient grafting of dipyridylmethane ligands on highly cross-linked as well as gel-type chloromethylated polystyrenes has been achieved using phenolic derivatives of the ligands.In this way, chiral polymer-supported ligands with pseudo-C₂ symmetry were obtained.The synthesis of the ligands and their grafting under mild conditions are described, as well as the preparation of monomeric models.During reduction of 6,6'-(2,2-dimethyl-1-oxopropyl) derivatives with sodium borohydride, the R,S isomers were unexpectedly formed with high selectivity.