Palladium‐Catalyzed Cycloisomerizations of Diarylacetylenes: Synthesis, Structures, and Physical Properties of Highly Substituted Naphthalenes and 8,8 a‐Dihydrocyclopenta[<i>a</i>]indenes
作者:Tsun‐Cheng Wu、Chia‐Cheng Tai、Hsin‐Chieh Tiao、Yu‐Ting Chang、Chia‐Chun Liu、Ching‐Hsiu Li、Cheng‐Hao Huang、Ming‐Yu Kuo、Yao‐Ting Wu
DOI:10.1002/chem.201100437
日期:2011.6.20
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.
根据其取代基的电子特性,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。这些化合物的结构通过X射线晶体学分析进行了验证。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。二氢环戊[一个]茚3在为固体或液体形式显示强发光,而环戊二烯并[一个]茚11j中实际上是无荧光。直接连接到化合物3的主链上的官能团会显着影响物理性能。芳基取代基引起的空间效应引起不同的发光现象,包括聚集诱导和增强的发射。