Preparation of an Aurylated Alkylthiophene Monomer via C–H Activation for Use in Pd-PEPPSI-iPr Catalyzed-Controlled Chain Growth Polymerization

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• 作者：Sabin-Lucian Suraru ; Jason A. Lee ; Christine K. Luscombe
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：April 19, 2016
• 年：2016
• 卷：5
• 期：4
• 页码：533-536
• 全文大小：283K
• 年卷期：0
• ISSN：2161-1653

文摘

In the search for new synthetic routes toward greener and more facile syntheses of conjugated polymers, C–H functionalization provides a promising solution by minimizing the production and processing of aryl halide monomer precursors used in traditional organometallic coupling reactions. In this paper, we investigate the use of Au(I) and its ability to directly C–H activate 2-bromo-3-hexylthiophene to form a reactive monomer species, bypassing the typical Grignard monomer formation from a dihalogenated thiophene. Addition of Pd-PEPPSI-iPr as a palladium catalyst source in the presence of the resultant aurylated thiophene monomer yielded poly(3-hexylthiophene) as observed by both NMR and GPC. Studies on the growth of these polymers show linear dependence between M_n and monomer conversion, low dispersities, as well as M_n predicted by catalyst loading, which is supportive of a living-type chain growth mechanism. This Au–Pd system represents a novel methodology for incorporating C–H activation into the synthesis of P3HT with control over M_n.