A highly regioselective, carbazole based Electron Donor Acceptor (EDA) catalyzed synthesis of biaryl and aryl–heteroaryl compounds is described. Various indole and carbazole derivatives were screened for the Homolytic Aromatic Substitution (HAS) reaction. Tetrahydrocarbazole (THC) was very efficient for the HAS transformation and proceeded via a complex formation between diazonium salt and electron
Modular Construction of Fluoroarenes from a New Difluorinated Building Block by Cross-Coupling/Electrocyclisation/Dehydrofluorination Reactions
作者:Jonathan M. Percy、Helena Emerson、James W. B. Fyfe、Alan R. Kennedy、Sergej Maciuk、David Orr、Lucie Rathouská、Joanna M. Redmond、Peter G. Wilson
DOI:10.1002/chem.201601584
日期:2016.8.16
were used to assemble precursors to 6π‐electrocyclisations of three different types. Electrocyclisations took place at temperatures between 90 and 240 °C, depending on the central component of the π‐system; nonaromatic trienes were most reactive, but even systems that required the temporary dearomatisation of two arenyl subunits underwent electrocyclisation, albeit at elevated temperatures. Photochemical
A catalytic amount of a reduced form of polyaniline (a redox-active π-conjugated polymer) was found to induce C−H direct arylation of (hetero)arenes with arenediazonium salts prepared fromanilines with methanesulfonic acid (MeSO3H) and tert-butyl nitrite (tBuONO). The difficult part of this method is the coexistence of an oxidant and a reductant in this sequential diazotization and arylation system;
Synthesis and Characterization of Highly Fluorescent and Thermally Stable π-Conjugates involving Spiro[fluorene-9,4'-[4H]indeno[1,2-b]furan]
作者:Toshiyuki Kowada、Kouichi Ohe
DOI:10.5012/bkcs.2010.31.03.577
日期:2010.3.20
Spiro[fluorene-9,4'-[4H]indeno[1,2-b]furan] was synthesized, and its $\pi$-conjugation was efficiently elongated using palladium-catalyzed C-H arylation of a furan moiety. The resulting $\pi$-conjugated compounds showed intense fluorescence and extremely high thermal stability.