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US 7,678,924 B2Granted
Process for the preparation of pyrazoles
AssigneeSyngenta Crop Protection AG
InventorsHarald Walter, Camilla Corsi, Josef Ehrenfreund, Clemens Lamberth, Hans Tobler
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Abstract
The present invention relates to a process for the preparation of compounds of formula I wherein R1 is C1-C4haloalkyl; R2 is C1-C6alkyl and R3 is methyl or ethyl, by reaction of compounds of formula II wherein the substituents are as defined for formula I, with compounds of formula III wherein R3 is as defined for formula I and n is 0 or 1.
Claims3
A process for the preparation of a compound of formula I
- wherein R1 is C1-C4haloalkyl;
- R2 is C1-C6alkyl and R3 is methyl or ethyl,
- wherein a compound of formula II
- wherein R1 and R2 are as defined for formula I, is reacted with a compound of formula III
- wherein R3 is as defined for formula I and n is 0 or 1.
2 more elements
Dependencies are inferred from the claim text.