A variety of diketopyrrolopyrrole (DPP)-based linear or branched π-conjugated oligomers, with a core of phenyl, phenyl-DPP, tetraphenylethene, pyrene and spirobifluorene, containing sequentially bis-, tris-, and tetra-DPP with various geometries and molecular weights of several thousands has been effectively accessed by one-step C–H activated coupling followed by a single column chromatographic separation. A further optical property study of all eight synthesized oligomers reveals the correlation between light absorption and the variation of geometries and π-conjugation lengths. This atom- and step-economical, and versatile synthetic strategy will be a powerful tool for accessing π-functional large oligomers, which enriches the library of π-materials and thus facilitates the fundamental structure–property study.

中文翻译：

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通过C–H活化偶联一步一步合成π共轭大低聚物

各种基于二酮吡咯并吡咯（DPP）的线性或支化π-共轭低聚物，具有苯基，苯基-DPP，四苯基乙烯，pyr和螺二芴的核心，依次包含具有不同几何结构和分子的双-，三-和四-DPP一步进行C–H活化偶合，然后进行单柱色谱分离，已有效地获得了数千重量。对所有八种合成低聚物的进一步光学性质研究表明，光吸收与几何形状和π共轭长度的变化之间具有相关性。这种原子经济和阶梯经济的多用途合成策略将成为访问π功能大型低聚物的有力工具，它丰富了π材料的库，从而促进了基本结构-性质的研究。