Poly[1,4-bis(4-alkyl-2-thienyl)-2,5-disubstituted phenylene]s and their monomers have been regioselectively synthesized in high yield. The head-to-head defined structures of all polymers and monomers are demonstrated by FT-IR, 1H, 13C NMR and elemental analysis. All new materials exhibit good thermally stability, optical, electrochemical properties. Their HOMO and LUMO energy levels are determined by cyclic voltammetry and UV-vis measurement. The improvement of absolute PL quantum yields of all six polymers in the solid films have been approved after the aromatic groups were introduced into the main chain of polythiophene. Three materials were chosen to be fabricated as single layer LED devices.

A novel conjugated polymer (PBBPTDEHP), which has a regioregular structure, was successfully synthesized in chloroform using FeCl3 as the oxidizing reagent. The polymer shows good thermal stability and can be easily dissolved in xylene, chloroform, tetrahydrofuran (THF) and other common organic solvents. Due to the symmetry of the monomer, the polymer formed contains no head-head conrgurational isomers and has high regioregular structure. The structure and the purity of the polymer were characterized by FTIR, 1H NMR, 13C NMR, MS, and elemental analysis. The absorption edge of the UV

In this paper we present the synthesis and characterization of a new light-emitting copolymer constituted of regularly alternating segments of 3,3

Synthesis of the key intermediate (5) of Antillatoxin (1) is presented. The synthesis is based on the indium-rnediated allylation of 2,4,6,6-tetramethyl-2,4-heptadienal (3) and methyl (Z)-2- (bromomethyl)-2-butenoate (4) in saturated ammonium chloride catalyzed by lanthanide triflate which afforded the corresponding product 2 in good yield and high syn selectivity.

Indium mediates the coupling of β-bromocrotylbromide with carbonyl compounds in saturated ammonium chloride in the presence of lanthanide triflate under sonication to give the corresponding compouads in good yield and moderate to high syn diastereoselectivity.