Method for producing 3-amino-4-substituted-5-pyrazolones

Abstract

The invention provides a method for producing a compound represented by the following formula (II), comprising executing alkali hydrolysis of a compound represented by the following formula (I) with an alkali metal hydroxide in the presence of a barium compound to from the compound represented by formula (II), precipitating the barium compound in the form of a barium halide, and eliminating the barium halide: 1 wherein L represents a thiocyano group, an aryloxy group, an alkoxy group, an alkylthio group, an arylthio group, a heterocyclic thio group, an imide group, an imidazolyl group, a pyrazolyl group or a triazolyl group; R1 represents an unsubstituted or substituted alkyl group, or an unsubstituted or substituted aryl group; R2 represents a substituent; and n represents an integer of 0 to 5; in a case where n is 2 or larger, R2 may be the same or different.

Dependencies are inferred from the claim text.