发明名称 |
Procedimiento para la preparación de unos compuestos intermedios |
摘要 |
<p>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.</p> |
申请公布号 |
ES2546960(T3) |
申请公布日期 |
2015.09.30 |
申请号 |
ES20060704443T |
申请日期 |
2006.02.07 |
申请人 |
SYNGENTA PARTICIPATIONS AG |
发明人 |
WANG, LINHUA;DOLBEARE, KRISTINE ANDERSON;ODOM, FRANKIE LEE |
分类号 |
C07C17/093;C07B39/00;C07C25/02 |
主分类号 |
C07C17/093 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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