Synthesis of Triptycene-Substituted Azapentacene and Azahexacene Derivatives
作者:Philipp Biegger、Olena Tverskoy、Frank Rominger、Uwe H. F. Bunz
DOI:10.1002/chem.201603360
日期:2016.11.2
We describe the synthesis and characterization of novel iptycene‐substituted azaacenes by using either a classic condensation route (diamine plus ortho‐quinone) and/or a Pd‐catalyzed coupling of an aromatic diamine with an aromatic dihalide. The attachment of an iptycene unit leads to a significant blueshift (15 nm) in the UV/Vis spectra of these azaacenes. The iptycene unit stabilizes a hexaazahexacene
<i>Bis</i>(trifluoroacetoxyiodo)benzene-Induced<i />Activation of<i>tert</i>-Butyl Hydroperoxide for the Direct Oxyfunctionalization of Arenes to Quinones
作者:Hamdullah Kilic、Mustafa Catir
DOI:10.1055/s-2004-832843
日期:——
Various aromatic hydrocarbons were oxidized with bis(trifluoroacetoxyiodo)benzene (PIFA)/tert-butyl hydroperoxide system to afford the corresponding quinones. The reaction conditions and scope have been discussed in detail.
The Oxidation of Biphenylene and Its Derivatives with Mn(OAc)<sub>3</sub>and Pb(OAc)<sub>4</sub>
作者:Kazu Kurosawa、Tetsuya Takamura、Yasunari Ueno、John F. W. McOmie、N. D. Pearson
DOI:10.1246/bcsj.57.1914
日期:1984.7
The reaction of biphenylene with Pb(OAc)4 gave 2-substituted biphenylenes and 2,3-biphenylenedione. The reaction of 2-methylbiphenylene and 2,3-dimethylbiphenylene with Mn(OAc)3 yielded products in which the methyl substituent had been oxidized. The reaction of 2-methoxybiphenylene with Pb(OAc)4 gave 2-acetoxy-3-methoxybiphenylene and r-2,c-3-diacetoxy-2-methoxy-2,3-dihydrobiphenylene, which is the
Biphenylenes. Part XIX. Reactions of mono- and di-methoxybiphenylenes and related compounds
作者:J. M. Blatchly、D. V. Gardner、J. F. W. McOmie、M. L. Watts
DOI:10.1039/j39680001545
日期:——
Monosubstitution occurs at the adjacent β-position on nitration of 2-acetamido-, 2-acetoxy-, and 2-methoxy-biphenylene, Claisen rearrangement of 2-allyloxybiphenylene, formylation of 2-hydroxy- and 2-methoxy-biphenylene, and Friedel–Crafts acetylation of 2,6- and 2,7-dimethoxybiphenylene. Oxidation of 2-hydroxybiphenylene gives unstable 2,2′-bi(biphenylenyl)-3,3′-quinone. Bromination of 2-methoxybiphenylene
A Stable Bis(benzocyclobutadiene)-Annelated Tetraazapentacene Derivative
作者:Philipp Biegger、Manuel Schaffroth、Olena Tverskoy、Frank Rominger、Uwe H. F. Bunz
DOI:10.1002/chem.201602675
日期:2016.10.24
the title compound, the biphenylenedione is coupled with a diaminobenzothiadiazole derivative. Reductive cleavage of the thiadiazole ring and subsequent condensation with the biphenylenedione gives the title compound in which a central tetraazapentacene is flanked by two benzocyclobutadiene units. This compound is stable despite its extended π‐system and its optical features are blueshifted in comparison