申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0061913A2
公开(公告)日:1982-10-06
Compounds of the formula
wherein
A is H, NO2 or halogen;
B is H, alkyl, alkenyl, halogen, N02, CN, SCN, CHO, alkoxy, alkylcarbonyl or alkoxycarbonyl;
Q1 and Q2 are each O or S;
X is N or CH;
W and Z are each H, alkyl, alkenyl, halogen, N02, CN, CF3 or alkoxycarbonyl;
exhibit pre-emergence and post-emergence activity against many grassy and broadleaved weeds. They may be formulated for use in conventional manner.
The novel compounds may be prepared by reacting a corresponding compound of formula
e.g. successively in either order, with compounds of formulae
wherein Y is a leaving group.
According to another feature of the invention an ortho-(5-halopyridin-2-yloxy) phenol is prepared by heating to a melt a mixture or catechol and an appropriately substituted 2,5-dihalopyridine under an inert atmosphere.
式中的化合物
式中
A 是 H、NO2 或卤素;
B 是 H、烷基、烯基、卤素、N02、CN、SCN、CHO、烷氧基、烷基羰基或烷氧基羰基;
Q1 和 Q2 均为 O 或 S;
X 是 N 或 CH;
W 和 Z 分别是 H、烷基、烯基、卤素、N02、CN、CF3 或烷氧基羰基;
对许多禾本科杂草和阔叶杂草具有萌前和萌后活性。它们可按常规方法配制使用。
新型化合物可通过将相应的式化合物
例如以任一顺序先后与式
其中 Y 为离去基团。
根据本发明的另一个特点,在惰性气氛下,将邻苯二酚和适当取代的 2,5-二卤吡啶混合物加热至熔融,制备邻(5-卤吡啶-2-氧基)苯酚。