- MANUFACTURING METHOD OF HERBICIDE
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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
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Paragraph 0053-0054; 0055; 0058-0059; 0060-0061; 0067
(2018/05/05)
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- Bispyribac derivative, and preparation method and application of bispyribac derivative
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The invention discloses a bispyribac derivative, and a preparation method and an application of the bispyribac derivative. The bispyribac derivative has the following structure as shown in the specification. The preparation method particularly comprises the following steps of: taking 2,6-dihydroxy-benzoic acid as a raw material for multi-step reactions to synthesize bispyribac (acid), then preparing bispyribac acyl chloride, further performing esterification reaction with 2-pyridyl ethanol to synthesize the bispyribac derivative, namely 2-(pyridine-2-yl) ethyl-2,6-bi((4,6-dimethoxy pyridine-2-yl) oxy) benzoate. The compound has better weeding activity and especially has better removal activity on a dicotyledonous weed, namely sisymbrium sophia, and the preparation method is simple to operate and higher in yield.
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- Method for preparing herbicide bispyribac-sodium through phase transfer catalyst
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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.
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Paragraph 0019; 0020
(2017/06/02)
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- Herbicidal composition
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The present invention relates to a herbicidal composition, comprising A) one or more compounds of the formula (I) 1in which Hal1 and Hal2 are identical or different halogen atoms, R1 is H, a cation or a C1-C20-carbon-containing radical and B) one or more surfactants, comprising as structural element at least 12 alkylene oxide units.
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- 2-fluoroacrylic acid derivatives, novel mixtures of herbicides and antidotes, and their use
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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.
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- Substituted (hetero) aryl compounds, process for their preparation, agents containing them and their use as safeners
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Substituted (hetero)aryl compounds, process for their preparation, agents containing them, and their use as safeners Compounds of the formula I and their salts, as defined in claim 1, are suitable as safeners for protecting crop plants against the phytotoxic side-effects of herbicides.
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- Substituted isoxazolines, process for their preparation, composition containing them, and their use of safeners
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Substituted isoxazolines, process for their preparation, compositions containing them, and their use as safeners. Compounds of the formula (I) and salts thereof, STR1 in which R1 is carboxyl, formyl or another acyl radical or a derivative of the last-mentioned 3 groups, R2 is hydrogen, halogen, C1 -C18 -alkyl, C3 -C8 -cycloalkyl, C2 -C8 -alkenyl, C2 -C8 -alkynyl, C1 -C18 -alkoxy, C2 -C8 -alkenyloxy, C2 -C8 -alkynyloxy, C1 -C18 -alkylthio, C2 -C8 -alkenylthio, each of the last-mentioned 9 radicals in each case being unsubstituted or substituted, or (C1 -C8 -alkoxy)carbonyl, and R3 and R4 independently of one another are an aliphatic, araliphatic or heteroaraliphatic radical having 1 to 30 carbon atoms which is unsubstituted or substituted by one or more functional groups, or an aromatic or heteroaromatic radical which is unsubstituted or substituted, are suitable as safenets for pesticides, preferably herbicides, in crop plants. The compounds can be prepared from alkenes (II) and nitrile oxides (III) by the process of claim 6.
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- Pyrimidine derivatives and herbicidal method and compositions
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A pyrimidine derivative having the formula: STR1 wherein R is hydrogen atom, --CH2 CH2 S(O)n R1 (wherein R1 is a lower alkyl group, and n is an integer of from 0 to 2) or STR2 (wherein each R1 is a lower alkyl group), A is a chlorine atom or a methoxy group, and each of D and E which may be the same or different, is a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group or a halogen-substituted lower alkoxy group, or a salt thereof.
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