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Novel phosphonic acid derivative and herbicide

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专利汇可以提供Novel phosphonic acid derivative and herbicide专利检索,专利查询,专利分析的服务。并且NEW MATERIAL:A compound expressed by formula I (X and Y represent H, -CF
3 , halogen atom or lower alkyl, provided that X and Y do not represent H together; Z represents =CH- or =N-; R
1 WR
3 represent H or lower alkyl).
EXAMPLE: A compound expressed by formula II.
USE: A herbicide having extremely advantageous selectivity.
PREPARATION: A compound expressed by formula III [example; 2-nitro-5-(2- chloro-4-trifluoromethylphenoxy)benzoic acid, etc.] is reacted with thionyl chloride expressed by the formula SOCl
2 to obtain a compound expressed by formula IV [example; 2-nitro-5-(2-chloro-4-trifuluromethylphenoxy)benzoylchloride, etc.]. The this compound is reacted with a compound expressed by formula V (example; diethylaminomethylphosphate, etc.) to obtain the compound expressed by formula I.
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