作者:Jungho Jo、Chunyan Chi、Sigurd Höger、Gerhard Wegner、Do Y. Yoon
DOI:10.1002/chem.200305659
日期:2004.6.7
An efficient synthesis of 9,9-bis(2-ethylhexyl)fluorene oligomers up to the heptamer is reported, with repetitive Suzuki and Yamamoto coupling reactions employed in the synthesis. The key steps for preparation of the essential intermediates include Pd-catalyzed transformation of aryl bromides to aryl boronic esters (Miyaura reaction) and the application of the much higher reactivity of aryl boronic
据报道,有效合成9,9-双(2-乙基己基)芴低聚物直至七聚体,在合成中采用了重复的铃木和山本偶联反应。制备必要中间体的关键步骤包括Pd催化的芳基溴化物向芳基硼酸酯的转化(Miyaura反应)以及芳基硼酸酯比芳基溴化物更高的反应性在Pd催化的交叉偶联反应中的应用芳基重氮盐。报告了UV / Vis吸收和光致发光特性随链长的变化。此外,描述了低聚物的玻璃化转变和液晶特性,并将其与聚合物的玻璃化转变和液晶特性进行了比较。