abstract |
The invention relates to a method for producing n-substituted 3-hydroxypyrazoles of formula (I), wherein R<1> stands for optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aryl or heteroaryl and R<2> and R<3> mean hydrogen, cyano, halogen and optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aryl or heteroaryl, by oxidizing a corresponding pyrazolidin-3-ons. |