首页> 外文期刊>Chemistry: A European journal >Palladium-catalyzed cycloisomerizations of diarylacetylenes: Synthesis, structures, and physical properties of highly substituted naphthalenes and 8,8 a-dihydrocyclopenta[a]indenes
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Palladium-catalyzed cycloisomerizations of diarylacetylenes: Synthesis, structures, and physical properties of highly substituted naphthalenes and 8,8 a-dihydrocyclopenta[a]indenes

机译:钯催化的二芳基乙炔的环异构化:高度取代的萘和8,8 a-二氢环戊[a]茚的合成,结构和物理性质

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摘要

Depending on the electronic properties of their substituents, the major products generated by palladium-catalyzed cycloisomerizations of diarylalkynes are either highly substituted 8,8a-dihydrocyclopenta[a]indenes 3 or naphthalenes 4. The structures of these compounds were verified by X-ray crystallographic analysis. Many functional groups tolerated the reaction conditions evaluated in this study. The isotope-labeled experiments indicated that added water has a critical role in forming both classes of compounds. The photophysical and electrochemical properties of cycloadducts 3 and their analogues were systematically studied and compared with computational predictions based on density functional theory. Dihydrocyclopenta[a]indenes 3 in either solid or liquid form display strong luminescence, whereas cyclopenta[a]indene 11 j is practically nonfluorescent. The functional groups directly attached to the backbone of compound 3 significantly influenced physical properties. The steric effect arising from the aryl substituents caused different luminescence phenomena, including aggregation-induced and -enhanced emission.
机译:取决于其取代基的电子性质,二芳基炔烃的钯催化环异构化反应生成的主要产物是高度取代的8,8a-二氢环戊[a]茚3或萘4。这些化合物的结构已通过X射线晶体学验证分析。许多官能团耐受本研究中评估的反应条件。同位素标记的实验表明,加水在形成这两类化合物中都起着至关重要的作用。系统研究了环加合物3及其类似物的光物理和电化学性质,并将其与基于密度泛函理论的计算预测进行了比较。固态或液态的二氢环戊[a]茚3均显示强发光,而环戊[a]茚11j实际上是非荧光的。直接连接到化合物3的骨架上的官能团会显着影响物理性质。由芳基取代基引起的空间效应引起不同的发光现象,包括聚集诱导的和增强的发射。

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