The present invention relates to a process for preparing 1-alkyl-3-difluoromethyl-5-hydroxypyrazoles, which are valuable intermediates for the production of fungicides: i. e. Process for preparing 1-alkyl-3-difluoromethyl-5-hydroxypyrazoles of the formula (I) in which R1 is a linear or branched C1-C6-alkyl group, comprising the reaction of alkyl difluoroacetoacetates of the formula (II) in which R2 is a linear or branched C1-C6-alkyl group, with alkylhydrazines of formula (III) NH2-NH-R1 (III) in the presence of an organic acid and of a solvent.
                            本发明涉及一种制备1-烷基-3-二
氟甲基-5-羟基
吡唑的方法,该方法是用于生产杀菌剂的有价值的中间体。即制备式(I)中R1为线性或支链C1-C6烷基的1-烷基-3-二
氟甲基-5-羟基
吡唑的方法,包括在有机酸和溶剂存在下,将式(II)中R2为线性或支链C1-C6烷基的烷基二
氟乙酰乙酸酯与式(III)NH2-NH-R1(III)的烷基
肼反应。