Dimethoxycarbene, generated at 110 °C by thermolysis of 2,2-dimethoxy-5,5-dimethyl-Δ3-1,3,4-oxadiazoline, displaces fluoride from aromatic rings that are activated with electron-withdrawing groups. Intermolecular substitution on Sanger's reagent and on hexafluorobenzene are reported, together with intramolecular substitution by a dioxycarbene with a tethered aryl group. Keywords: aromatic substitution, aryl(dimethoxy)fluoromethanes, aryl fluoride, dialkoxycarbene, nucleophilic substitution.
二甲氧基卡宾在110°C时通过2,2-二甲氧基-5,5-二甲基-Δ3-1,3,4-氧化二唑的热解生成,可以从带有电子吸引基团的芳香环中取代氟。报道了Sanger试剂和六氟苯上的分子间取代,以及带有烷基的芳基取代的分子内取代。关键词:芳香取代,芳基(二甲氧基)氟甲烷,芳基氟化物,二烷氧基卡宾,亲核取代。