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Fehling solution and glucose), and methanol (200 ml.) which had been saturated with ammonia at 0°, were hea ted in a stainless steel high pressure reactor at 200 0 for 18 hours. The contents were cooled to room temperature, transferred to a beaker, and the solvent was evaporated. The residue was thoroughly agitated with sodium hydroxide (0.5 N, 100 ml.) and allowed to stand overnight. The solid was separated from the basic solution by filtration and dissolved in boiling ethanol (95%, 100 ml.). This solution was decolorized with carbon and filtered. A small quantity of light green precipitate appeared, after the solu-tion had stood overnight, and was removed. The nature of this precipitate has not been determined. The filtrate was evaporated to half volume and water was added to the hot solution to permanent cloudiness. The precipitate which formed was collected and recrystallized from benzene to give small white needles, of 2-(J>-ethoxyphenyl)-4-amino-6methyl-3(2H)-pyridazone, 1.5 g. (32%), m.p. 156-157°.

Aus der Kondensation von 2-Aminobenzimidazol (1) mit den Trifluormethyl-P-Diketonen 2s-f gehen die 2-Trifluormethylpyrimido[1,2-a]benzimidazole 38-f hervor. Auffallende herbizide Wirksamkeit vermag 3a zu entfalten. Herbicides, 11: 2-(Trifluoromethyl)pyrimido[l,2-n]benzimidazoIesThe condensation of 2-aminobenzimidazole (1) with the trifluoromethyl-P-diketones 2a-f furnishes the 2-(trifluoromethyl)pyrimido[1,2-~]benzimidazoles 3a-f. Marked herbicidal activity is exhibited by 3a.