179ChemInform Abstract The alkali metal salts (I), derived from formanilides, are coupled with 4,6-dinitrobenzofuroxan (II) to generate the Meisenheimer complexes (III). These are converted to the target compounds (IV) upon heating in an aqueous solution. A one-pot modification of this method consists in treatment of the formanilides (V) with aqueous sodium hydroxide and subsequent refluxing in the presence of the furoxan (II). (Mechanism).

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

According to (IIIa), all the Meisenheimer complexes (IIIa)‐(IIIc) are prepared from dinitrobenzofuroxan (I) and the respective alkali amides.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The formanilides (I) are deprotonated with sodium hydride (II) or potassium hydroxide to generate the sodium (III) or potassium salts which are heated with benzofuroxan (IV), producing the 2‐arylbenzotriazole 1‐oxides (V).