Title:
中間体の調製方法
Document Type and Number:
Japanese Patent JP5254625
Kind Code:
B2
Abstract:
The present invention provides a process for the production of intermediate compounds of formula (I), wherein the substituents are as defined herein. The process comprises reacting a substituted aniline with aqueous HX, followed by removal of water by azeotropic distillation and diazotization and pyrolysis with an organic nitrite at elevated temperatures in the absence of a copper catalyst. Alternatively, gaseous HX can be used to substitute aqueous HX in the process. Consequently, a step of water removal by azeotropic distillation can be eliminated. The intermediate compounds of formula I are suitable as intermediates in the preparation of herbicidally active 3-hydroxy-4-aryl-5-oxopyrazoline derivatives.
Inventors:
One, Rinfa
Dolville, Christine Anderson
Frankie Lee, Odom
Dolville, Christine Anderson
Frankie Lee, Odom
Application Number:
JP2007553565A
Publication Date:
August 07, 2013
Filing Date:
February 07, 2006
Export Citation:
Assignee:
Syngenta Partitions Akchen Gesell Shaft
Syngenta Limited
Syngenta Limited
International Classes:
C07C17/093; C07C17/383; C07C25/02; C07B61/00
Domestic Patent References:
| JP1283230A | ||||
| JP2003502403A |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Fukumoto product
Tetsuji Koga
Ayako Kondo
Yoichi Watanabe
Kazuhiro Nakamura
Takashi Ishida
Fukumoto product
Tetsuji Koga
Ayako Kondo
Yoichi Watanabe
Kazuhiro Nakamura