Method for producing N-substituted 2-pyrazoline-5-one

摘要

The present invention relates to a process for preparing N-substituted 2-pyrazolin-5-ones of the formula I ;where R has the meaning given in claim 1, which comprises reacting a compound of the formula II ;where R, X and Y have the meanings given in claim 1, at elevated temperature with a molar excess of alkali metal hydroxide in an aqueous reaction medium and then adjusting the pH to pH6 by adding an acid.