Invention Grant
- Patent Title: Process for the preparation of pyrazoles
- Patent Title (中): 制备吡唑的方法
-
Application No.: US11577511Application Date: 2005-10-19
-
Publication No.: US07678924B2Publication Date: 2010-03-16
- Inventor: Harald Walter , Camilla Corsi , Josef Ehrenfreund , Clemens Lamberth , Hans Tobler
- Applicant: Harald Walter , Camilla Corsi , Josef Ehrenfreund , Clemens Lamberth , Hans Tobler
- Applicant Address: US NC Greensboro
- Assignee: Syngenta Crop Protection, Inc.
- Current Assignee: Syngenta Crop Protection, Inc.
- Current Assignee Address: US NC Greensboro
- Agent William F. Mulholland, II
- Priority: CH1750/04 20041021
- International Application: PCT/EP2005/011232 WO 20051019
- International Announcement: WO2006/045504 WO 20060504
- Main IPC: C07D231/10
- IPC: C07D231/10
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.
Public/Granted literature
- US20090069572A1 PROCESS FOR THE PREPARATION OF PYRAZOLES Public/Granted day:2009-03-12
Information query
