Most organic materials for optoelectronic applications are conjugated organic system. The burgeoning synthetic methodologies using organometallic catalysts or reagents have provided a powerful arsenal to design and synthesize new conjugated organic materials. It is particularly noteworthy that carbon-carbon bond formation involving a Csp2 or Csp at the reaction center can readily be achieved. For examples, cross-coupling reactions (e.g. Kumada-Corriu reaction, Stille reaction, and Suzuki reaction) are extremely powerful for the synthesis of Csp2-Csp2 single bond. Sonogashira reaction, on the other hand, serves as a useful entry for the preparation of alkynylarenes or conjugated enynes. Heck reaction furnishes a coupling between an aryl halide and an alkene. Alternatively, olefination reactions provides a practical route for the synthesis of carbon-carbon double bond. In the past decade, we have uncovered four new kinds of transformations staring from the dithioacetal functionality (Scheme).1,2 Three of them have been employed in the synthesis of conjugated small molecules as well as conjugated oligomers/polymers. Their syntheses, photophysical as well as electroluminescent properties will briefly be discussed. ……
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