Preparation of 2-Unsubstituted 5-Aryl(hetaryl)-1-hydroxy-1 H -Imidazoles from of 4-Aryl(hetaryl)-1-hydroxy-2,5-dihydro-1 H -Imidazole-2-carboxylic Acid 3-Oxides

Alkylaromatic 1-hydroxyamino-2-oximes reacted at the hydroxyamino group with glyoxylic acid hydrate, providing 4-aryl(hetaryl)-1-hydroxy-2,5-dihydro-1H-imidazole-2-carboxylic acid 3-oxides that were converted upon heating into 5-aryl(hetaryl)-1-hydroxy-1H-imidazoles containing a hydrogen atom at the heterocycle position 2.