Synthesis of a stereoblock polyketone through ancillary ligand exchange

A new technique for the synthesis of stereoblock polymers through ancillary ligand exchange during polymer chain growth is introduced. Cooperativity between chain-end and site control mechanisms through ligand exchange to control polymer microstructure is also demonstrated through the rapid exchange of enantiomeric ligands in these systems. The synthesis of block copolymers is of great interest since they offer the most effective way of combining the properties of two or more homopolymers in a single material.