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    • 6. 发明公开
    • 중간체의 제조 방법
    • 制备中间体的方法
    • KR1020070110290A
    • 2007-11-16
    • KR1020077018180
    • 2006-02-07
    • 신젠타 파티서페이션즈 아게
    • 왕린후아돌베아레크리스틴앤더슨오돔프랭키리
    • C07C17/093C07C25/02
    • C07B39/00C07C17/093C07C25/02
    • 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.
    • 本发明提供了制备式(I)中间体化合物的方法,其中取代基如本文所定义。 该方法包括使取代的苯胺与HX水溶液反应,然后通过共沸蒸馏除去水,并在不存在铜催化剂的情况下在高温下用有机亚硝酸盐进行重氮化和热解。 或者,可以使用气态HX来代替该过程中的HX水溶液。 因此,可以消除通过共沸蒸馏除水的步骤。 式I的中间体化合物适用作制备除草活性3-羟基-4-芳基-5-氧代吡唑啉衍生物的中间体。