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.

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

A new series of conjugated polymers constituted of 3-alkylthiophenes and 1,4-di(1,3,4-oxadiazolyl)phenylene are synthesized through precursor polymers of polyhydrazides. The solubility of the precursor polymers and the corresponding target polymers is improved by increasing the length of side chains on thiophene rings, which results in a higher degree of the conversion from the precursors to the final polymers and thus results in longer effective conjugated length in the polymers bearing longer side chains. The thermal stability and electrochemical properties of the polymers are studied. The polymers emit blue light under the irradiation of UV light in their film states. The relative fluorescence yield in solutions increases with the increase in length of side chains on thiophene rings in the polymers and reaches up to 79% for the polymer bearing octyl side chains. The possibility of polymers being used as electroluminescent material in polymer light-emitting diodes (PLEDs) is demonstrated by the successful fabrication of a single-layer device of indium tin oxide (ITO)/polymer/Ca, which emits visible blue light above 8 V of forward bias.