A simple, direct, high-yield Friedel-Crafts synthesis of highly chlorinated, overcrowded αH-aryl, αH-diaryl, and αH-triarylmethanes is described. The latter compounds are most valuable chemical precursors of inert free radicals, which are frequently obtained through otherwise cumbersome, medium-to-low-yield aromatic chlorination of triphenylmethane derivatives. The condensation is performed with aluminium chloride at temperatures ranging from 70 to 160°C. The substrate is a benzene with all its hydrogens flanked by two ortho chlorines. The alkylating component is chloroform, αH-heptachlorotoluene (2a) or αH-undecachlorodiphenylmethane (3a). For comparison, the condensation with a few non-sterically-hindered substrates has also been performed.
Red Organic Light-Emitting Radical Adducts of Carbazole and Tris(2,4,6-trichlorotriphenyl)methyl Radical That Exhibit High Thermal Stability and Electrochemical Amphotericity
carbazolyl derivatives with a pendant stableradical of the TTM (tris-2,4,6-trichlorophenylmethyl radical) series are reported. The EPR spectra, electrochemical properties, absorption spectra, and luminescent properties of these radical adducts have been studied. All of them show electrochemical amphotericity being reduced and oxidized to their corresponding stable charged species. The luminescence properties
for quantum information processing. However, reports on the spin relaxation mechanisms of organic conjugated molecules are rare and the research methods are also limited. Herein, we study the molecular design and spin relaxation mechanisms by systematically varying the structure of a conjugatedradical. We found that solid‐state relaxation times of organic materials are largely different from that in
Mixed-halide triphenyl methyl radicals for site-selective functionalization and polymerization
作者:Lisa Chen、Mona Arnold、Rémi Blinder、Fedor Jelezko、Alexander J. C. Kuehne
DOI:10.1039/d1ra04638a
日期:——
resulting radical compounds show higher stability and site-specific reactivity in cross-coupling reactions, due to the better leaving group character of the para-bromide. The mixed halide radicals give access to complex, and so far inaccessible luminescent open-shell small molecules, as well as polymers carrying the radical centers in their backbone. The new mixed-halide triphenyl methylradicals represent