An unprecedented KHMDS-promoted domino reaction to furnish hydroxyfluoranthenes is described. Biaryl compounds bearing acyl and naphthylalkenyl moieties are transformed into 9-hydroxydibenzo[j,l]fluoranthenes in a single step through the formation of an aromatic and a pentagonal ring system. A variety of fluoranthenes including those with extended π-conjugation, a heteroaromatic ring, and unsymmetrical
Modular Design of Fluorescent Dibenzo- and Naphtho-Fluoranthenes: Structural Rearrangements and Electronic Properties
作者:Gavin S. Mohammad-Pour、Richard T. Ly、David C. Fairchild、Alex Burnstine-Townley、Demetrius A. Vazquez-Molina、Khang D. Trieu、Andres D. Campiglia、James K. Harper、Fernando J. Uribe-Romo
DOI:10.1021/acs.joc.8b00891
日期:2018.8.3
naphtho-fluoranthene polycyclic aromatic hydrocarbons (PAHs) with MW = 302 (C24H14) was synthesized via a Pd-catalyzed fluoranthene ring-closing reaction. By understanding the various modes by which the palladium migrates during the transformation, structural rearrangements were bypassed, obtaining pure PAHs in high yields. Spectroscopic and electrochemical characterization demonstrated the profound diversity
通过Pd催化的荧蒽闭环反应合成了MW = 302(C 24 H 14)的12种二苯并蒽和萘并荧蒽多环芳烃(PAHs)库。通过了解转变过程中钯迁移的各种模式,可以绕开结构重排,以高收率获得纯净的PAH。光谱和电化学表征证明了异构体之间电子结构的巨大差异。突出可见光发射方面的显着差异,该PAHs库将使它们的标准化能够用于毒理学评估和作为光电材料的潜在用途。
Synthesis and palladium-catalysed transformation of an annelated barrelene
作者:Gerald Dyker、Thomas Kerl、Peter G. Jones、Ina Dix、Peter Bubenitschek
DOI:10.1039/a606857j
日期:——
The annelated barrelene 8 is easily accessible in a three-step
reaction procedure from simple starting materials. An intermolecular
palladium-catalysed arylation at the strained tetrasubstituted double
bond of the barrelene finally leads to polycyclic hydrocarbons.
Preparation of Condensed Aromatics by Superacidic Dehydrative Cyclization of Aryl Pinacols and Epoxides<sup>1</sup><sup>a</sup>
作者:Douglas A. Klumpp、Donald N. Baek、G. K. Surya Prakash、George A. Olah
DOI:10.1021/jo970293n
日期:1997.9.1
Aryl pinacols and epoxides, respectively, are cleanly and in high yield converted via superacidic dehydrative cyclization to the corresponding condensed aromatics. Dehydrative cyclization of benzopinacol (1a), triphenylacetophenone (2), and tetraphenylethylene oxide (9) give 9,10-diphenylphenanthrene (3a) as the major product in acidic media stronger than H-o = -11. Aryl pinacol 12a forms the condensed aromatic 13a as the major product in acidic media stronger than H-o = -13.5. It is proposed that the dehydrative cyclizations to provide aromatics 3a and 13a occurs through dicationic intermediates. Substituted benzopinacols 1f, 1g, and 1j are prepared and give the corresponding phenanthrenes (3f, 3g, and 3j) in high yields. The regiochemistry of the cyclization of substituted benzopinacols is controlled by deactivating substituents on the aryl rings. Aryl pinacols (12a-d) derived from acenaphthenequinone and pinacol 15 also give condensed aromatics (13a-d and 16, repectively) with superacidic triflic acid.