A novel (5+1) annulation reaction of functionalized 2-isocyanophenyloxyacrylate and aromatic, aliphatic isocyanides has been disclosed. This strategy allows for a quick access to many 2H-benzo[b][1,4]oxazin-2-one derivatives.

A novel bicyclization reaction of two molecular allenyl ketones and isocyanides has been disclosed. This strategy allows for the construction of structurally complex spirocyclic lactam–lactone systems in an efficient manner.

We report here a multicomponent protocol to assemble several polycyclic dihydropyran-fused tetrahydroquinoline structures with excellent diastereoselectivity. This procedure employs simple feedstocks to accomplish a series of diverse structures, which is difficult to attain by traditional sequences.

A series of thio-imino-tetrahydroacridine iron complexes, (TITha)FeCl 2 , were synthesized and applied to ethylene polymerization. This class of NNS type iron complexes were designed by integrating a fused ligand backbone into our previously reported thio-imino-quinoline iron complexes (TIQ)-FeCl 2 , with a major purpose to improve the thermal stability. Among the (TITha)FeCl 2 series, complex 3c with ortho-Et substituents on the N-aryl ring exhibits high activity and thermal stability [up to 10.1 × 10 6 g of PE (mol of Fe) −1 h −1 at 50 °C and 2.3 × 10 6 g of PE (mol of Fe) −1 h −1 at 100 °C], producing highly linear low molecular weight polyethylene wax with narrow molecular weight distributions and unsaturated chain end. The comparison of catalytic behavior between (TITha)FeCl 2 and (TIQ)FeCl 2 indicates the modification of the tridentate ligand by introducing a more rigid backbone not only enhances the catalytic performance at high temperature but also exerts a significant impact on controlling the structures of the polymers.