Eight-Membered-Ring-Forming Chain-Growth Cyclopolymerization of 2,2'-Diisocyano-1,1'-binaphthalenes for the Synthesis of Helical Poly([1,4]diazocine-2,3-diyl)s

Novel helical macromolecules, poly([1,4]diazocine-2,3-diyl)s (PDACs), are synthesized by living cyclopolymerization of 2,2'-diisocyano-1,1'- binaphthalenes in the presence of organonickel or organopalladium complexes as initiators. The conformation of the main PDAC chain obtained from (R)-monomer is deduced from experimental results as (M)-helix and depends on the optical purity of the monomer.