取决于应用,并苯的光化学氧化可以提高或阻碍其功能。尽管在反应位点上带有烷氧基取代基的并苯对于诸如药物输送和有机光电之类的应用很重要,但化学结构对其光化学氧化的影响仍然未知。因此,本文描述了单线态氧(1 O 2)一系列的二烷氧基乙炔,它们在(杂)并苯核心中稠合环的数量和类型各不相同。醌前体的还原烷基化产生目标二烷氧基乙炔,其稠合主链的范围从苯并二噻吩到四噻吩噻吩。其实验光谱特性的趋势与时变密度泛函理论(TD-DFT)的计算结果一致。NMR研究表明,光化学生成1 O 2在有机溶剂中将除这些芳烃中的一种以外的所有芳烃氧化为相应的内过氧化物。这些氧化的速率与稠合的芳烃的数量和类型相关,较长的二烷氧基并烷通常比较短的衍生物快氧化。最后,在酸性氧化环境中照射这些并苯会裂解醚键。这项工作影响了从事有机光电子学的人们,以及对利用功能材料中的光生活性氧种类感兴趣的人们。
<i>In Situ</i> Reduction and Functionalization of Polycyclic Quinones
作者:Karl J. Thorley、Yang Song、Sean R. Parkin、John E. Anthony
DOI:10.1021/acs.orglett.0c02529
日期:2020.9.18
Attempts to functionalize polycyclicquinones using lithium diisopropylamide as a base led to the unexpected formation of acenes. This reaction proceeds by electron transfer from the base to the electron deficient quinone, whose radical anion can react with a variety of electrophiles. Siloxy derivatives synthesized by this method could be easily isolated but showed poor photostability. In situ reduced
Synthesis, isolation, and characterization of derivatives of an anthrathiophene dimer (TOTBAT) and of anthradithiophene oligomers (ADTO), possessing octylthiophene units on their backbone, are described. These semiconductors are prepared through oxidative copper(II) chloride coupling. The spectroscopic properties and stability of these newly synthesized semiconductors were evaluated and supported by
Novel .pi.-extended thiophene-fused electron acceptors for organic metals
作者:Pilar De la Cruz、Nazario Martin、Fuencisla Miguel、Carlos Seoane、Armando Albert、Felix H. Cano、Araceli Gonzalez、Jose M. Pingarron
DOI:10.1021/jo00049a027
日期:1992.11
Novel pi-extended thiophene-fused TCNQ-type and DCNQI-type acceptors have been synthesized from the corresponding quinones by reaction with Lehnert's reagent and bis(trimethylsilyl)carbodiimide (BTC), respectively. Additionally, an example of the little-known hybrid TCNQ-DCNQI-type acceptor has also been obtained. The cyclic voltammetric data of the novel acceptors reveal two different behaviors for these molecules. The TCNQ-type derivatives exhibit a two-electron single-wave reduction to the dianion, as confirmed by controlled potential coulometry analysis. The DCNQI-type derivatives display two reduction waves to the corresponding radical anion and dianion. The same behavior is shown by the hybrid TCNQ-DCNQI derivative. The acceptor ability is related to molecular planarity, and a comparative crystallographic study involving TCNQ-type and DCNQI-type derivatives (6a, 7a, and 8a) has been performed.