The synthesis of ortho-(trimethylsilyl)triphenylenyl triflates 7 is described. Fluoride-induced decomposition of these triflates leads to the generation of didehydrotriphenylenes (triphenylynes) 6. These arynes undergo [4+2] cycloadditions with dienes to afford the corresponding Diels-Alder adducts or palladium-catalyzed formal [2+2+2] cycloadditions to afford extendedtriphenylenes.
reaction showed compatibility with both electron‐poor and electron‐rich substrates, thus allowing the synthesis of pyridine‐ and thiophene‐fused nanographenes. It also enabled the synthesis of sterically hindered contorted π‐conjugated molecules without causing full aromatization. A kinetic study showed that the CDHC reaction under the conditions used is a very fast process, and some reactions are completed
Intramolecular Aryl–Aryl Coupling of Fluoroarenes through Al<sub>2</sub>O<sub>3</sub>-Mediated HF Elimination
作者:K.Yu. Amsharov、P. Merz
DOI:10.1021/jo300783y
日期:2012.6.15
A strategy for effective intramolecular aryl-aryl coupling of fluoroarenes through Al2O3-mediated HF elimination is reported. It is demonstrated that the C-F bond, which is widely believed to be the most passive functionality in organic chemistry, can be reconsidered as a useful functional group allowing very effective C-C bond formation. The solid-state strategy presented in this study opens the possibility for facile syntheses of insoluble extended polycyclic aromatic hydrocarbons.
Uncatalyzed Zirconium-Mediated Biphenylation of <i>o</i>-Dihalobenzenes To Form Triphenylenes
作者:Cameron L. Hilton、Christopher R. Jamison、Benjamin T. King
DOI:10.1021/ja065602i
日期:2006.11.1
The reaction of [Zr(biphe)3][(Li.(THF)4)2], where biphe is 2,2'-biphenyldiyl, with an o-dihaloarene produces a triphenylene. Two new bonds are created in this rare example of an uncatalyzed, Zr-mediated aryl-aryl bond formation. Multiple biphe fragments can be incorporated to give larger triphenylene-containing polycyclic aromatic hydrocarbons. This reaction can introduce significant strain and was demonstrated to tolerate alkyl and methoxy substituents.
Diels-Alder reactivity of polycyclic aromatic hydrocarbons. 1. Acenes and benzologs