| 摘 要： | 1 Results The initial report of polymeric light-emitting diodes (PLEDs) based on poly(p-phenylenevinylene) gave birth to an intense research effort in conjugated polymers, primarily focused on the development of optoelectronic and electrochemical devices. Significant developments in modern synthetic chemistry, especially the chemistry of carbon-carbon bond formation have allowed the synthesis of various well-defined conjugated polymers and oligomers with optimized physical properties.Meanwhile, these reactions normally require a transition metal catalyst, which results in a problem in materials purification that is harmful to materials physical properties. On the other hand, Wittig and Knovenagel condensations are also famous reactions for the formation of carbon-carbon double bond, which can proceed without a transition metal catalyst.
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