Formic acid oxidatively cleaves 1,2,3,4-tetraaryl-2-butene-1,4-diones to 1,2-diaryl-1,2-ethanediones under microwave irradiation
摘要:
Formic acid oxidatively cleaves 1,2,3,4-tetraaryl-2-butene-1,4-diones (1,2-aroylstilbenes) to 1,2-diaryl-1,2-ethanediones (benzils) under microwave irradiation. Mechanistic probing revealed that formic acid incorporates one of its oxygen atoms into benzil. (c) 2007 Elsevier Ltd. All rights reserved.
Oxidation of Tetraarylselenophenes and Benzo[<i>b</i>]selenophene with<i>m</i>-Chloroperbenzoic Acid
作者:Juzo Nakayama、Tomoki Matsui、Noriko Sato
DOI:10.1246/cl.1995.485
日期:1995.6
Oxidation of tetraarylselenophenes with m-chloroperbenzoic acid produces cis-1,2-diaroyl-1,2-diarylethylenes and SeO2 as the principal product, while the oxidation of benzo[b]selenophene affords benzo[b]selenophene 1-oxide.
Oxidation of aromatic compounds: XVII. Oxidative cross-dimerization of diarylacetylenes in the system CF3CO2H-CH2Cl2-PbO2. Characteristic of cation-radicals of diarylacetylenes by cyclic voltammetry and ESR spectroscopy
作者:A. V. Vasil’ev、A. P. Rudenko
DOI:10.1134/s1070428010090034
日期:2010.9
The oxidation of mixtures of diarylacetylene ArCa parts per thousand CAr and Ar'Ca parts per thousand CAr' in a system CF3CO2H-CH2Cl2-PbO2 (0A degrees C, 1.5 h) results in products of cross-dimerization, (Z)-1,2,3,4-tetraarylbut-2-ene-1,4-diones Ar(ArCO) C=C(COAr')Ar'. The routes of transformation of intermediate cation-radicals of diarylacetylenes [ArCa parts per thousand CAr](+center dot) into the final products of oxidative dimerization are elucidated. By cyclic voltammetry and ESR spectroscopy the high reactivity of the diarylacetylene cation-radicals is demonstrated, the character of their singly occupied molecular orbitals (a(2) or b(1)) has been revealed by ESR method.