125401-75-4Relevant articles and documents
MANUFACTURING METHOD OF HERBICIDE
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Paragraph 0053-0054; 0055; 0058-0059; 0060-0061; 0067, (2018/05/05)
PROBLEM TO BE SOLVED: To provide an industrially desirable, economical and environmental friendly manufacturing method of sodium 2,6-bis(4,6-dimethoxypyrimidine-2-yloxy) benzoate known as herbicide bispyribac-sodium salt , further a manufacturing method capable of being conducted safely in an industrial scale. SOLUTION: There is provided a manufacturing method of compounds represented by the formula (3), especially sodium 2,6-bis(4,6-dimethoxypyrimidine-2-yloxy) benzoate, including reacting a compound represented by the formula (1) with a compound represented by the formula (2) in the presence of alkali metal hydroxide and in the presence of a solvent having relative dielectric constant of 5 to 80 and acceptor number of 0 to 60, excluding dimethyl sulphoxide. R1 and R2 are each independently (C1-C4)alkyl, M is H or an alkali metal atom. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPO&INPIT
Method for preparing herbicide bispyribac-sodium through phase transfer catalyst
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Paragraph 0019; 0020, (2017/06/02)
The invention relates to a preparation method of herbicidal technical, in particular to a method for preparing a herbicide bispyribac-sodium through a phase transfer catalyst. The method comprises the step that 2-substituted-4,6-dimethoxy pyrimidine and 2,6-dihydroxy-benzoic acid serve as raw materials to react in solvent at the temperature of 0 DEG C to 150 DEG C in the presence of potassium carbonate and a catalyst, and then bispyribac-sodium is prepared. The method is characterized in that the phase transfer catalyst is adopted as the catalyst, and the phase transfer catalyst is a quaternary phosphonium salt or quaternary ammonium salt or polyether phase transfer catalyst. According to the method, bispyribac-sodium is prepared by adopting the phase transfer catalyst, the reaction yield is high and is increased by 10% or above at a time compared with an existing method, and an extremely important significance is achieved on bispyribac-sodium production.
2-fluoroacrylic acid derivatives, novel mixtures of herbicides and antidotes, and their use
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, (2008/06/13)
The invention relates to novel α-fluoroacrylic acid derivatives, to active compound/antidote combinations which comprise α-fluoroacrylic acid derivatives and are outstandingly suitable for use in crops of useful plants, to their use and to methods for protecting crop plants.