JPH08193005A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE: To obtain a herbicide for a paddy' field capable of controlling weeds in a paddy field by one treatment for a long period of time, usable from a period before emergence of weeds prior to rice planting up to a growing period with a smaller amount of active ingredients, comprising both a new 3-pyrrolin-2- one derivative and a pyrazole derivative. CONSTITUTION: This herbicide for a paddy field is obtained by blending a new 3-pyrrolin-2-one derivative of formula I (X is H or F) with one or more pyrazole derivatives, shows a synergistic action which can not be expected from single use of each component, is usable at any time from a period before emergence of weeds prior to rice transplantation up to a growing period by one treatment with a smaller amount of active ingredients. 4 (2,4-Dichlorobenzoyl)-1,3- dimethylpyrazol-5-yl-p-toluenesulfonate or 1,3-dimethyl-4-(2,4-dichlorobenzoyl)-5- phenacyloxypyrazole is preferable as the pyrazole derivative. The compound of formula I is obtained by treating an amide derivative of formula II with a proper base and subjecting to intramolecular aldol condensation reaction.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a novel 3-pyrroline-2
The present invention relates to a paddy herbicide composition containing an -one derivative and a pyrazole derivative as active ingredients.

[0002]

2. Description of the Related Art Conventionally, various compounds and admixtures have been known as herbicides for paddy fields. Furthermore, recently, a mixture called a one-shot treatment agent has been developed which can control various weeds by one treatment. However, these herbicides have problems that they require a relatively large amount of active ingredients, they cannot be properly controlled by a single treatment even though they are one-shot agents, and that the duration of their effects is short. There are a lot of cases. Therefore, it is desired to develop paddy field herbicides that can control important weeds accurately and for a long time with a smaller amount of active ingredients.

[0003]

DISCLOSURE OF THE INVENTION The present invention uses a smaller amount of active ingredient and can be used at any time from before the emergence of weeds before rice planting to the growing season. An object is to provide a herbicide for paddy fields that can be controlled for a long period of time.

[0004]

Means and Actions for Solving the Problems The inventors of the present invention have conducted extensive studies on a novel mixture of 3-pyrrolin-2-one derivatives to solve the above problems, and as a result, 3-
By mixing the pyrrolin-2-one derivative and the pyrazole derivative, a synergistic effect that cannot be predicted from the effects of each is shown, and by using less active ingredients, it can be used at any time from before weeding before rice planting to the growing season. The present invention has been completed by finding that a herbicide for paddy fields that can be used and can control important weeds in paddy fields for a long period of time is obtained. That is, the present invention has the general formula (I)

[0005]

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(In the formula, X represents a hydrogen atom or a fluorine atom.) At least one of 3-pyrrolin-2-one derivatives represented by the formula: 4- (2,4-dichlorobenzoyl) -1, 3-dimethylpyrazol-5-yl-p-toluenesulfonate (hereinafter referred to as compound A), 1,3-
Dimethyl-4- (2,4, -dichlorobenzoyl) -5
-Phenacyloxypyrazole (hereinafter referred to as compound B)
Or 1,3-dimethyl-4- (2,4-dichloro-3)
-Methylbenzoyl) -5- (4-methylphenacyloxy) pyrazole (hereinafter referred to as compound C) and at least one pyrazole derivative as an active ingredient. is there.

The 3-pyrrolin-2-one derivative of the present invention is a novel compound and can be produced by the method represented by the reaction formulas (1) and (3).

[0008]

Embedded image

That is, the general formula (II) (in the formula, X
Represents a hydrogen atom or a fluorine atom. The amide derivative represented by) can be produced by treating the amide derivative with a suitable base to proceed the intramolecular aldol condensation reaction.

Suitable bases used in this reaction include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide and lithium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide and barium hydroxide, and metals. Alkali metals such as sodium, potassium metal and lithium, metal hydrides such as sodium hydride and lithium hydride, alcoholates such as potassium t-butoxide and sodium alkoxide, picoline, quinoline and 1,8-diazabicyclo [5. 4.0] Organic bases such as undecene-7 (DBU).

This reaction can be carried out in a suitable solvent or without solvent. Suitable solvents include, for example, aromatics such as benzene, toluene and xylene, ethers such as dioxane, tetrahydrofuran and diethyl ether,
Esters such as ethyl acetate and butyl acetate, methanol,
Examples thereof include lower alcohols such as ethanol, propanol and butanol, and aprotic polar solvents such as dimethylformamide and dimethylacetamide. The reaction temperature is -70 to 170 ° C, and the reaction may be carried out at the reflux temperature of the solvent.

The amide derivative represented by the general formula (II) can be produced by the method represented by the reaction formula (2).

[0013]

[Chemical 4]

That is, the aminoketone derivative represented by the general formula (III) and the carboxylic acid derivative represented by the general formula (IV) (wherein X represents the same meaning as described above and Q represents a halogen atom). , In the presence of a suitable base.

The reaction is carried out without solvent or in a suitable solvent. Suitable solvents include aromatics such as benzene, toluene, xylene, chlorobenzene and dichlorobenzene, halogenated hydrocarbons such as dichloromethane, chloroform and carbon tetrachloride, ethers such as diethyl ether, tetrahydrofuran and dioxane, ethyl acetate. And esters such as butyl acetate. Suitable bases are triethylamine, pyridine, dimethylaniline, diisobutylethylamine, sodium carbonate, potassium carbonate, sodium hydrogencarbonate, etc., and the reaction proceeds at any temperature.

The aminoketone derivative of the general formula (III) can be produced by reacting 1-methyl-1- (naphthalen-2-yl) ethylamine with halogenoacetone,
The carboxylic acid derivative represented by the general formula (IV) is a commercial product.

The compounds A, B and C according to the present invention are all known compounds, and are disclosed in JP-A-50-126830, JP-A-54-41872 and JP-A-57-7, respectively.
Further, the compound A is commercially available as a general name pyrazolate, the compound B is pyrazoxifene, and the compound C is commercially available as benzophenap.

The compound group represented by the general formula (I) has excellent activity as a herbicide for paddy fields, and is highly active especially for millet, eel, annual broadleaf weeds, etc., but has no effect on perennial weeds such as Urikawa. Low. On the other hand, compounds A, B, C
Is known to be a highly effective herbicide against broad-leaved weeds such as Urikawa, but its effectiveness against fly is low. As described above, the compound group represented by the general formula (I) and the compounds A, B and C may not be expected to have a sufficiently satisfactory herbicidal effect when used alone.

The inventors of the present invention investigated the mixed use of the compound of the general formula (I) and the compounds A, B and C, and showed a synergistic effect which could not be expected at the beginning, and as a result, they could be used alone. It was found that the use of a much smaller amount of rice can precisely control important weeds in paddy fields without damaging the paddy fields.

The herbicide composition of the present invention thus obtained may be used as it is as the drug substance for the plant to be treated, but it is generally mixed with an inert liquid or solid to prepare a commonly used formulation form, For example, it is used after being adjusted to powders, granules, wettable powders, emulsions, flowables and the like. Further, an auxiliary agent can be added if necessary for formulation.

The carrier may be either solid or liquid as long as it is usually used for agricultural and horticultural chemicals, and is not limited to a particular one. For example, solid carriers include mineral powders such as clay, talc, bentonite, calcium carbonate, diatomaceous earth and white carbon, plant powders such as soybean powder and starch, petroleum resins, polyvinyl alcohol, polyalkylene glycols and the like. Examples thereof include molecular compounds, urea, waxes and the like. Examples of the liquid carrier include various oils, various organic solvents, water and the like.

As the auxiliary agent, surfactants, binders, stabilizers and the like which are usually used in agricultural and horticultural chemicals can be used alone or in combination as required. Further, in some cases, an industrial bactericidal agent or an antibacterial / antifungal agent may be added for antibacterial / antifungal purposes.

As the surfactant, nonionic, anionic, cationic and amphoteric surfactants can be appropriately used. Preferred examples include alkylphenols, higher alcohols, alkylnaphthols, higher fatty acids, fatty acid esters, dialkylphosphate amines and the like obtained by polymerizing ethylene oxide and propylene oxide, alkyl sulfate ester salts (sodium lauryl sulfate, etc.), alkyl sulfonates. (Sodium 2-ethylhexene sulfonate), aryl sulfonate (sodium lignin sulfonate, sodium dodecylbenzene sulfonate, etc.)
Is mentioned.

The herbicidal composition of the present invention contains the 3-pyrrolin-2-one derivative represented by the general formula (I) and the compounds A, B and C in a wide mixing ratio in a wide range. You can expect an effect. However, the mixing ratio of both is usually 3-
With respect to 1 part by weight of the pyrrolin-2-one derivative, the compound A,
B and C are each 0.5 to 300 parts by weight, preferably 3-
With respect to 1 part by weight of the pyrrolin-2-one derivative, the compound A,
Each of B and C is 1 to 100 parts by weight.

The herbicidal composition of the present invention is used for the treatment of flooded soil,
It is effective in all treatment methods such as soil treatment, soil mixed layer treatment, and foliar spraying treatment, but it is preferably used in flooded soil treatment. The amount applied is 0.01 kg as the active ingredient amount.
It is possible to use in a wide range from 1 to 50 kg / ha, but it is preferable to use in a range of 0.1 kg to 5 kg / ha as a standard.

The herbicidal composition of the present invention can be used in combination with one or more kinds of other herbicides, pesticides such as insecticides and plant growth regulators, soil conditioners or fertilizers. Needless to say, it is also possible to prepare a mixed preparation with these, and a synergistic effect can be expected in some cases.

[0027]

EXAMPLES Next, the production method of the compound represented by the general formula (I) according to the present invention will be specifically explained with reference to production examples.

Production Example 1 1- [1-Methyl-1- (naphthalen-2-yl) ethyl] -4-methyl-3- (2-fluorophenyl) -3
-Preparation of Pyrrolin-2-one [Compound No.-1] N- [1-Methyl-1-] in 20 ml of dichloromethane.
(Naphthalen-2-yl) ethyl] -N- (2-oxopropyl) amine (3.0 g) and pyridine (3.5 g) were added, and 2-fluorophenylacetic acid chloride (1.8 g) was added dropwise at 5 to 10 ° C. After stirring at room temperature for 1 hour, a saturated aqueous solution of sodium hydrogen carbonate was added and the mixture was extracted with dichloromethane. After drying over anhydrous sodium sulfate, the mixture was concentrated with an evaporator, and the obtained oil was dissolved in 20 ml of ethyl acetate. After adding 10 ml of a 28% methanol solution of sodium methylate and stirring under reflux for 15 minutes, the temperature was returned to room temperature, water was added, and the mixture was extracted with ethyl acetate. Wash with 6% aqueous hydrochloric acid and saturated aqueous sodium bicarbonate,
It was dried over anhydrous sodium sulfate. By concentrating with an evaporator and performing silica gel column chromatography, 1- [1-methyl-1- (naphthalene-2) of the present invention is obtained.
-Yl) ethyl] -4-methyl-3- (2-fluorophenyl) -3-pyrrolin-2-one (3.7 g) was obtained. mp126.0-128.0 ° C IRνKBr (cm ^-1 ): 1667 NMR (270MHz, CDCl ₃ ) δppm: 1.97 (6H, s), 2.00 (3H, s), 3.93
(2H, s), 7.05 ~ 7.19 (2H, m) 7.26 ~ 7.34 (1H, m), 7.40 ~ 7.56
(4H, m), 7.78 ~ 7.84 (4H, m)

In the same manner as in Production Example 1, 1- [1-methyl-1- (naphthalen-2-yl) ethyl] -4-methyl-3-phenyl-3-pyrroline-2-n according to the present invention.
ON [compound number-2] was prepared. The physical properties are described below. mp122.0-124.0 ° C IRνKBr (cm ^-1 ): 1671 NMR (270MHz, CDCl ₃ ) δppm: 1.97 (6H, s), 2.11 (3H, s), 3.89
(2H, s), 7.26 ~ 7.60 (8H, m) 7.78 ~ 7.85 (4H, m)

Further, an example of production of an important intermediate for producing the compound of the general formula (I) according to the present invention will be described below. Reference Example 1 Synthesis of N- [1-methyl-1- (naphthalen-2-yl) ethyl] -N- (2-oxopropyl) amine N- [1- in 20 ml of N, N-dimethylformamide
Methyl-1- (naphthalen-2-yl) ethyl] amine (4.5 g), potassium carbonate (3.0 g), and chloroacetone (3.8 g) were added, and the mixture was stirred at 80 ° C for 1 hr. The insoluble matter was filtered off, 100 ml of water was added, and the mixture was extracted with toluene. After drying over anhydrous sodium sulfate, concentration with an evaporator and silica gel column chromatography,
5.8 g of the desired aminoketone was obtained. IR ν film (cm ^-1 ): 3326,1720 NMR (270MHz, CDCl ₃ ) δppm: 1.56 (6H, s), 2.02 (3H, s), 3.31
(2H, s), 7.42 to 7.51 (2H, m) 7.54 to 7.58 (1H, m), 7.76 to 7.83
(4H, m)

Next, formulation examples of the herbicide according to the present invention will be shown as examples and test examples of herbicidal activity thereof will be shown. Example 1 (Wettable powder) Compound (1) according to the present invention: 10 parts by weight, Compound (A): 40 parts by weight, Neoperex (trade name, manufactured by Kao; sodium dodecylbenzenesulfonate): 2 parts by weight, Neugen EA80 (trade name, manufactured by Dai-ichi Kogyo Seiyaku; polyoxyethylene nonylphenyl ether): 2 parts by weight,
White carbon: 5 parts by weight and 41 parts by weight of diatomaceous earth were well pulverized and mixed to obtain a wettable powder.

Example 2 (flowable agent) Compound (1) according to the present invention: 5 parts by weight, compound (B): 20 parts by weight, sodium ligninsulfonate:
Water: 71.7 parts by weight was added to 2 parts by weight and polyoxyethylene alkylaryl ether: 1 part by weight, mixed and pulverized with a sand grinder, and then xanthan gum: 0.3 part by weight, and a flowable agent. Got

Example 3 (Flowable Agent) Sun extract P252 (trade name, the same as above) dissolved in 3 parts by weight of compound (2) according to the present invention, 10 parts by weight of compound (C) and 40 parts by weight of water. : 10 parts by weight by wet pulverization and mixing, and then dissolved in 36.6 parts by weight of water, Kelzan S (trade name, manufactured by Kelco; xanthan gum): 0.2 parts by weight and Deltop (trade name, manufactured by Takeda Chemical Industries: organic) Iodine antifungal agent): 0.2 parts by weight was added and mixed to obtain a flowable agent.

Example 4 (Powder) Compound (1) according to the present invention: 1 part by weight, compound (A): 10 parts by weight, Emulgen 910 (trade name, manufactured by Kao; polyoxyethylene nonylphenyl ether):
0.5 parts by weight and kaolin clay: 88.5 parts by weight were well pulverized and mixed to obtain a dust.

Example 5 (Dust) Compound (2) according to the present invention: 3 parts by weight, Compound (C): 20 parts by weight, sodium ligninsulfonate:
3 parts by weight, polyoxyethylene alkylaryl ether: 2 parts by weight and clay: 72 parts by weight were mixed and pulverized to obtain a powder.

Example 6 (Dry flowable agent) Finely ground compound (1) according to the present invention: 2 parts by weight, compound (B): 20 parts by weight, sodium alkylbenzenesulfonate: 15 parts by weight and polypropylene glycol polyethylene glycol ether : 63 parts by weight were mixed to obtain a dry flowable agent.

Example 7 (Granule) Compound (1) according to the present invention: 2 parts by weight, Compound (A): 15 parts by weight, Neoperex (trade name, the same as above): 2 parts by weight, Sun Extract P252 (Product name, manufactured by Sanyo Kokusaku Pulp; sodium lignin sulfonate): 2 parts by weight, bentonite: 60 parts by weight and talc: 19 parts by weight, are mixed well, and then an appropriate amount of water is added to wet them,
Next, it was extruded and granulated by a horizontal extrusion granulator. This is 30
After air-drying at ~ 60 ° C and crushing, 0.3-2 mm with a granulator
The granules were sized to obtain granules.

Example 8 (Granule) 1 part by weight of compound (2) according to the present invention, compound (C):
4 parts by weight, Gosenol GL-05
s (Nippon Gosei Kagaku PVA): 2 parts by weight, Sunextract P252 (Sanyo Kokusaku Pulp Sodium Lignin Sulfonate): 2 parts by weight and Clay: 91 parts by weight, and then an appropriate amount of water is added to wet them. Then, it was extruded and granulated by a horizontal extrusion granulator. This was air-dried at 60 to 90 ° C. and crushed, and then sized to 0.3 to 1 mm with a sizing machine to obtain a granule.

Example 9 (Emulsion) Compound (2) according to the present invention: 5 parts by weight, Compound (A): 10 parts by weight, Solpol 800A (trade name, manufactured by Toho Kagaku; nonionic surfactant and anion) Emulsion was obtained by mixing and dissolving 10 parts by weight of a mixture of organic surfactants) and 75 parts by weight of o-xylene.

Test Example 1 Flooded soil treatment test (pre-emergence treatment) The soil was filled in a 1/5000 arenagner pot and seeds or tubers of rice, eel, firefly, urinary vine were sown to make a flooded state. Two paddy rice seedlings (2 to 3 leaf stage) that had been raised in advance were used as one strain, and the two strains were transplanted and grown in a greenhouse. 1 day later (before weed emergence),
A predetermined amount of the test composition was treated with the granules prepared according to the method described in Example 7, and after 30 days, the occurrence of weeds and the chemical damage to paddy rice were observed and investigated. The results are shown in Table 1 (Tables 1 to 3).

In the table, the degree of damage to the test plants and the degree of chemical damage to the crops are shown based on the following criteria in comparison with the case where the growth state of the plants is untreated.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

Test Example 2 Flooded Soil Treatment Test (Growth Season Treatment) The soil was filled in a 1/5000 arengren pot, and seeds or tubers of the rice barley, eel, firefly, Urikawa were sown to establish a flooded state. Two paddy rice seedlings (2 to 3 leaf stage) that had been raised in advance were used as one strain, and the two strains were transplanted and grown in a greenhouse. When the number of leaves was 2.5 leaves, a predetermined amount of the test composition was treated with the granules prepared according to the method described in Example 7, and after 30 days, the condition of weeds generation and rice paddy Observed and investigated the chemical damage situation.
The results are shown in Table 2 (Tables 4 to 6).

In the table, the degree of damage to the test plant and the degree of chemical damage to the crop are shown in the same manner as in Test Example 1. In order to further clarify the synergistic effect of mixing, the effect expected at each mixing was calculated by the following calculation formula (Equation 1) and shown in Table 3 (Tables 7 to 9) together with the actually measured values. If the measured value of the effect by the test exceeds the calculated value, it can be judged that there is a synergistic effect.

[0047]

[Equation 1] Calculation formula used for predicting the effect (gradation from 0 to 10) E = X + Y- (XY / 10) X: Effect when the herbicide I is used in α kg / ha Y: Herbicide II Effect of using βkg / ha E: Herbicide I αkg / ha, Herbicide II βkg / h
Effect expected when used (SRColby., "Caluculating Synerigistic and Antagon
istic Responses of Herbicide Combinations "Weeds 1
5, 20-22 (1973))

[0048]

[Table 4]

[0049]

[Table 5]

[0050]

[Table 6]

[0051]

[Table 7]

[0052]

[Table 8]

[0053]

[Table 9]

[0054]

The herbicidal composition of the present invention has the general formula (I)
A 3-pyrrolin-2-one derivative represented by
Compared with the herbicidal effect that can be expected when each of B and C is used alone, due to the extremely high synergistic effect, it is possible to exert a high effect for a long period of time on important weeds in paddy fields with a lower dose. As a result, the herbicidal composition of the present invention can accurately control important weeds in paddy fields for a long period of time by a single treatment, has high applicability as a herbicide for paddy fields, and the present invention provides an extremely useful herbicide. It is a thing.

Continuation of the front page (72) Inventor Harukado Aoki 1144, Togo, Mobara-shi, Chiba Mitsui Toatsu Chemical Co., Ltd.

Claims (1)

[Claims] 1. General formula (I) (Chemical formula 1) (In the formula, X represents a hydrogen atom or a fluorine atom), and at least one or more 3-pyrrolin-2-one derivative represented by 4- (2,4-dichlorobenzoyl) -1,3.
-Dimethylpyrazol-5-yl-p-toluenesulfonate, 1,3-dimethyl-4- (2,4, -dichlorobenzoyl) -5-phenacyloxypyrazole and 1,3-dimethyl-4- (2,4) -Dichloro-3-methylbenzoyl) -5- (4-methylphenacyloxy)
A herbicide composition for paddy fields, which comprises at least one pyrazole derivative consisting of pyrazole as an active ingredient.