| abstract |
The present invention relates to a method for producing N-substituted 3-hydroxypyrazoles of the formula I wherein R is C-C-alkyl, C-C-alkenyl, C-C-alkynyl, C-C-cycloalkyl, aryl selected from phenyl and naphthyl; heteroaryl selected from furyl, thienyl, pyrrolyl, isoxazolyl, isothiazolyl, pyrazolyl, oxazolyl, imidosolyl, pyridyl, pyridazinyl, pyrimidinyl or triazinyl, and R, R are hydrogen, cyano, halogen and C-C-alkyl, C-C-alkyl, C-C-alkyl, C-C-alkyl, C -C-alkynyl, C-C-cycloalkyl; aryl selected from phenyl and naphthyl; heteroaryl selected from thuryl thienyl, pyrrolyl, isoxazolyl, isothiazolyl, pyrazolyl, oxazolyl, imidazolyl, pyridyl, pyridazinyl, pyrimidinyl or triazinyl, and the substituents R, R and R are inert under the reaction conditions by oxidation of pyrazolidin-3-one. |