Selective cyclopolymerization of alpha,omega-dienes and copolymerization with ethylene catalyzed by Fe and Co complexes.

Fe complexes with bis(imino)pyridine ligands catalyze cyclopolymerization of 1,6-heptadiene in the presence of MMAO (modified methylalumoxiane) co-catalyst to produce the polymer containing five-membered rings in every repeating unit. The complexes with Me, Et, and Cl substituents at the N-aryl groups of the ligand produce the polymer in high yields and in high trans-cis ratio of the five-membered rings. The molecular weights of the polymers, M(n) by GPC, are higher than 6000.

Photoluminescent and liquid-crystalline properties of donor-acceptor-type 2,5-diarylthiazoles.

The synthesis of donor-acceptor-type 2,5-diarylthiazoles that bear electron-donating N,N-dialkylamine and electron-withdrawing cyano groups at the 2- and 5-position, respectively, were carried out with transition-metal-catalyzed C-H arylation reactions developed by us. The compounds were synthesized by the C-H arylation of unsubstituted thiazole at the 2-position with a palladium/copper catalyst in the presence of tetrabutylammonium fluoride (TBAF) as an activator. Further C-H arylation of the 2-arylated thiazole at the 5-position was carried out by the palladium-catalyzed reaction in the presence of silver(I) fluoride to afford the donor-acceptor-type 2,5-diarylthiazoles with N,N-dialkylamine groups of different chain lengths.