Verfahren zur Herstellung von Pyrazolonderivaten

摘要

Pyrazolone derivatives of the general formula (wherein R1 represents a C1-6 alkyl group and R2 represents hydrogen or a C1-6 alkyl group) are prepared by condensing a piperidyl-4-hydrazine of the general formula with a substituted cinnamic acid ester of the general formula (wherein Hal represents chlorine or bromine and R3 a C1-6 alkyl group). The products so obtained may be converted into salts with organic or inorganic acids. Specification 843,690 is referred to.