Polymerization of Aryl Polyisocyanides Catalyzed by N-Heterocyclic Carbene-Ligated Scandium Trialkyl Complex

Polyisocyanide has attracted continuous attention because of its stable helical rod structure and wide application, it a unique π-conjugated system in which the carbon-nitrogen double bond each unit is twisted along polymeric backbone to form configuration. In this paper, series aryl isocyanides polymers are prepared using N-heterocyclic carbene-ligated scandium trialkyl complex 1 (IPr)Sc(CH 2 SiMe 3 ) as catalyst equiv. [Ph C][B(C 6 F 5 4 ] co-catalyst. The can convert 96% 100 monomer minutes activity polymerization reach 329 kg polymer molSc -1 h . Two optically active obtained by chiral monomers, they show strong CD signal at 364 nm two signals opposite.