JPH053447B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a herbicidal composition characterized by containing an N-substituted chloroacetanilide and a sulfonylurea derivative as active ingredients. [Problems to be solved by the prior art and the invention] The following four properties are essentially required of herbicides. First, it must be safe for crops; second, it must have a broad herbicide spectrum necessary to completely kill the many types of weeds that grow in crop-growing areas; and third, it must be safe for crops. Fourth, it has long-lasting efficacy and, fourth, it has more effective herbicidal action when applied in small amounts. The present inventors have conducted extensive research with the aim of developing an excellent herbicide that satisfies the above properties, and have developed the following general formula: (However, in the formula, R ₁ represents a halogen atom, an alkoxy group, an alkylthio group, an alkoxyalkyl group, or an alkylthioalkyl group, and R ₂ and R ₃ are the same or different hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, It represents an alkylthio group, an alkoxyalkyl group, or an alkylthioalkyl group, R ₄ represents a hydrogen atom or an alkyl group, R ₅ ,
R ₆ and R ₇ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, alkenyl groups, alkynyl groups, alkoxy groups, or alkylthio groups. ) The N-substituted chloroacetanilide represented by the following has already been proposed (JP-A-58-111077 and others). The present inventors further discovered that a herbicide composition containing an N-substituted chloroacetanilide represented by the above general formula and a specific sulfonylurea derivative as active ingredients exhibits a synergistic effect that could not be expected from the properties of each alone. We have discovered that it has a wide herbicidal spectrum at low doses. Based on these new findings, the present inventors have completed and proposed the present invention. [Means for solving the problems] The present invention is based on the following general formula [], (However, in the formula, R ₁ , R ₂ and R ₃ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, alkylthio groups, alkoxyalkyl groups or alkylthioalkyl groups, and R ₄ represents a hydrogen atom or an alkyl R ₅ , R ₆ and R ₇ are the same or different hydrogen atoms, halogen atoms, alkyl groups, alkenyl groups, alkynyl groups, alkoxy groups, or alkylthio groups. Acetanilide and the following general formula [] (However, in the formula, R ₈ and R ₉ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, or alkoxy groups, R ₁₀ represents a hydrogen atom, an alkyl group, or an alkoxy group, and R ₁₁ , R ₁₂ , and R ₁₃ represents the same or different hydrogen atom, halogen atom, alkyl group, alkoxy group, hydroxysulfonyloxy group, alkylsulfonyloxy group, carboxylic acid group or its ester group, and Y represents an oxygen atom or an alkylene group. , Z represents a nitrogen atom or a methine group, and n represents 0 or 1) as an active ingredient. One component of the herbicidal composition of the present invention is an N-substituted-chloroacetanilide represented by the following general formula []. (However, in the formula, R ₁ , R ₂ and R ₃ are the same or different hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, alkylthio groups, alkoxyalkyl groups,
or represents an alkylthioalkyl group, R ₄ represents a hydrogen atom or an alkyl group, and R ₅ , R ₆ and R ₇ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, alkenyl groups, alkynyl groups, alkoxy groups, or Indicates an alkylthio group. ) A small portion of the N-substituted-chloroacetanilide represented by the above general formula [], that is, the 2-position of the thiophene ring

[Formula] is bonded, R ₁ is a hydrogen atom or an alkyl group, R ₂ , R ₃ and R ₄ are hydrogen atoms, R ₅ is an alkyl group,
Compounds in which R ₆ is a hydrogen atom, an alkyl group or an alkoxy group and R ₇ is a hydrogen atom, an alkyl group or a halogen atom are known from US Pat. No. 3,901,917. However, most of the other
It is a new compound. In the general formula [], specific examples of the halogen atoms represented by R ₁ , R ₂ , R ₃ , R ₅ , R ₆ and R ₇ include:
Examples include chlorine, bromine, fluorine, and iodine atoms. Furthermore, in the general formula, R ₁ , R ₂ , R ₃ , R ₄ ,
The alkyl groups represented by R ₅ , R ₆ and R ₇ are linear,
It may be in any branched form, and the number of carbon atoms is not particularly limited. However, from the viewpoint of easy availability of raw materials, the number of carbon atoms is preferably 1 to 6. Specific examples of the alkyl group include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, t-butyl group, n-pentyl group, n-hexyl group. etc. In the general formula [], the alkoxy groups represented by R ₁ , R ₂ , R ₃ , R ₅ , R ₆ and R ₇ are not particularly limited, but are generally linear or branched groups having 1 to 6 carbon atoms. Branched saturated or unsaturated groups are preferred. Specific examples of the alkoxy group that are generally preferably used include methoxy group, ethoxy group, n-propoxy group, t-butoxy group, n-pentoxy group, n-hexoxy group, allyloxy group, and the like. In the general formula [], the alkylthio groups represented by R ₁ , R ₂ , R ₃ , R ₅ , R ₆ and R ₇ are not particularly limited and any known alkylthio group can be used, but they generally have 1 to 1 carbon atoms. Six straight-chain or branched saturated or unsaturated groups are preferred. Specific examples of the alkylthio group suitably used include methylthio group, ethylthio group, n-propylthio group, t-butylthio group, n-pentylthio group, n-hexylthio group, and allylthio group. In addition, in the above general formula, the alkoxyalkyl group represented by R ₁ , R ₂ and R ₃ is not particularly limited in the number of carbon atoms, but is a linear or branched saturated or unsaturated group having 2 to 6 carbon atoms. is suitable, and specific examples of the alkoxyalkyl group include methoxymethyl group, methoxyethyl group, ethoxymethyl group, n-propoxymethyl group, t-butoxyethyl group, allyloxyethyl group, and the like. Furthermore, in the general formula, the alkylthioalkyl group represented by R ₁ , R ₂ and R ₃ is not particularly limited in the number of carbon atoms, but may be a linear or branched saturated or unsaturated group having 2 to 6 carbon atoms. Examples of the alkylthioalkyl group include methylthiomethyl group,
Methylthioethyl group, ethylthiomethyl group, n-
Examples include propylthiomethyl group, t-butylthioethyl group, and allylthioethyl group. Also,
In the general formula, the alkenyl groups represented by R ₅ , R ₆ and R ₇ may be linear or branched, and the number of carbon atoms is not particularly limited. However, from the viewpoint of easy availability of raw materials, the number of carbon atoms is preferably 2 to 4. Specific examples of the alkenyl group include vinyl group, allyl group, iso-propenyl group, 2-butenyl group,
Examples include 3-butenyl group. Furthermore, in the general formula, the alkynyl groups represented by R ₅ , R ₆ and R ₇ are:
The number of carbon atoms is not particularly limited, regardless of whether it is linear or branched, but it is preferable that the number of carbon atoms is 2 to 4 as described above. Specific examples of the alkynyl group include ethynyl group, 2-propynyl group, and the like. Among the above N-substituted-chloroacetanilides, R ₁ is a halogen atom, an alkoxy group, an alkylthio group, an alkoxyalkyl group, or an alkylthioalkyl group, and R ₂ and R ₃ are the same or different hydrogen atoms, halogen atoms, an alkyl group, an alkoxy group, an alkylthio group, an alkoxyalkyl group, or an alkylthioalkyl group, R ₄ is a hydrogen atom or an alkyl group, R ₅ , R ₆ and R ₇ are the same or different hydrogen atoms, halogen atoms, Compounds with alkyl, alkenyl, alkynyl, alkoxy, or alkylthio groups can completely kill annual weeds such as field weeds and perennial weeds such as cypress even when used at low concentrations of 15 g/10a or less. Not only does it have an excellent weeding effect, but it also has 500
Since it is completely harmless to rice even when used at a high concentration of g/10a, it is preferably used in the present invention. In particular, at least one of R ₁ to _{R 3} is a substituent other than a hydrogen atom, and this substituent is bonded to the thiophene ring.

[Formula] is substituted at the ortho position, R ₄ is a hydrogen atom, and at least two of R ₅ to _{R 7} are substituents other than hydrogen atoms,
N-substituted chloroacetanilide in which these substituents are substituted at the 2- and 6-positions of the phenyl group is particularly preferably used because the above-mentioned properties are stronger. The structure of the N-substituted-chloroacetanilide represented by the general formula [] can be confirmed by the following means. (b) By measuring the infrared absorption spectrum (IR), it is possible to observe absorption based on CH bonds around 3150-2800 cm ^-1 and characteristic absorption based on carbonyl bonds of amide groups around 1680-1660 cm ^-1 . I can do it. (b) Measure the mass spectrum (MS) and calculate the composition formula corresponding to each peak observed (generally a value expressed as m/e, which is the ion mass number m divided by the ion charge number e). By this method, it is possible to know the molecular weight of the compound subjected to measurement and the bonding mode of each atomic group within the molecule. In other words, the sample subjected to measurement is expressed by the general formula [] When expressed as The molecular weight of can be determined. Furthermore, regarding the N-substituted-chloroacetanilide represented by the general formula [], M -Cl, M -
_COCH2Cl and

〔effect〕

The herbicidal composition of the present invention described above exhibits a herbicidal effect that cannot be expected from the properties of each component alone. In other words, the herbicidal composition of the present invention can be used against perennial weeds such as staghorn snails and snails, for which complete herbicidal effects cannot be expected when either N-substituted-chloroacetanilide or sulfonylurea derivatives are used alone. Demonstrates excellent weeding effect. Therefore, the herbicidal composition of the present invention has a broader herbicidal spectrum than that of its constituent components alone, and has a greater herbicidal effect. Furthermore, it is safe for crops. Therefore, the herbicidal composition of the present invention fully satisfies the properties required of a herbicide and is extremely useful. EXAMPLES The herbicidal composition of the present invention will be specifically explained below using Examples, but the present invention is not limited to these Examples. Synthesis of N-substituted-chloroacetanilide (Synthesis Example 1) N-[2'-(5'-bromo)-thienylmethyl]-
2,6-dimethylaniline 1.81g (6.14×10 ^-3
mole) was dissolved in 40 ml of benzene, 0.81 g (7.98 x 10 ^-3 mole) of triethylamine was added, and the mixture was placed in ice water. Then 0.83g of chloroacetyl chloride
(7.37×10 ⁻³ mole) in benzene solution (15 ml) was gradually added. After stirring for 3 hours, the mixture was heated at 50°C for 1 hour. After cooling the reaction mixture to room temperature,
It was washed successively with 50 ml of water, 50 ml of 2N hydrochloric acid, and then 50 ml of water, and the benzene layer was dried over anhydrous sodium sulfate. Thereafter, it was purified by column chromatography to obtain 1.13 g of a yellow solid. As a result of measuring the infrared series spectrum of this product, it showed an absorption based on the C-H bond at 3110 to 2900 cm ^-1 and a strong absorption based on the carbonyl bond of the amide group at 1670 cm ^-1 . Its elemental analysis values are C48.43%, H4.05%, N3.99%, and _C15
This is the calculated value for H ₁₅ NSOB _r Cl (372.71)
It matched well with C48.20%, H4.32%, and N3.75%. In addition, when mass spectra were measured, m/
Molecular ion peak corresponding to molecular weight (M
), a peak corresponding to M-Cl at m/e336,
A peak corresponding to M-COCH ₂ Cl at m/e293,
m/e143 (100%) The corresponding peaks are shown. Furthermore, the 1H-nuclear magnetic resonance spectrum is as shown as a specific example in the specification. From the above results, it is clear that the isolated product is N-[2'-(5'-
bromo)-thienylmethyl]-N-chloroaceto-
It became clear that it was 2,6-dimethylanilide (hereinafter abbreviated as compound (1)). The yield is N
-[2'-(5'-bromo)-thienylmethyl]-2,6
−49.5% (3.04×10 ^-3 for dimethylaniline)
mole). (Synthesis Example 2) The properties, physical properties (boiling point), characteristic absorption values in the infrared absorption spectrum, and elemental analysis results of N-substituted-chloroacetanilide synthesized in the same manner as in Synthesis Example 1 are listed in Table 1. Furthermore, the general formula in Table 1 is the general formula [] Corresponding to, A is

[Formula], B is R ₄ , D is

[Formula] means.

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[Table] Next, formulation examples and examples of the herbicide composition of the present invention are shown. In addition, in the formulation examples and examples, N-substituted-
Chloroacetanilide was represented by compound numbers [(1) to (66)] in the synthesis examples, and sulfonylurea derivatives were represented by the following symbols ([A] to [N]).

【table】

[Table] Formulation example 1 2 parts by weight of compound [A], 8 parts by weight of compound (1), surfactant Solpol 800A [trademark of Toho Chemical Industry Co., Ltd.]
1.5 parts by weight, 1.5 parts by weight of surfactant Detargent 60 (trademark of Lion Yushi Co., Ltd.) and Siegrite 87
Parts by weight were thoroughly ground and mixed to obtain a wettable powder. Formulation example 2 4 parts by weight of compound [A], 16 parts by weight of compound (17), 10 parts by weight of surfactant Solpol SM 100 [trademark of Toho Chemical Industry Co., Ltd.], and dimethylformamide
70 parts by weight were thoroughly mixed to obtain an emulsion. Formulation Example 3 0.15 parts by weight of compound [A], 0.75 parts by weight of compound (39), 3 parts by weight of dioctyl succinate, 3 parts by weight of sodium tripolyphosphate, 30 parts by weight of bentonite and 63.1 parts by weight of talc were thoroughly mixed and ground, and water was added. After addition and kneading, the mixture was granulated, dried, and sized to 14 to 32 mesh to obtain granules. Formulation Example 4 40 parts by weight of bentonite, 56 parts by weight of talc, and 4 parts by weight of sodium ligninsulfonylate are pulverized and mixed, added with water, kneaded, and then granulated and dried to produce granules containing no active ingredient. 99.1 parts by weight of the granules were impregnated with 0.15 parts by weight of compound [A] and 0.75 parts by weight of compound (40) to obtain granules. Example 1 A Wagner pot equivalent to 1/5000 are is filled with water-mixed paddy soil, and seeds of broad-leaved weeds such as Japanese grasshopper, Japanese cypress, firefly, and broad-leaved weeds such as Japanese grasshopper, Japanese cypress, and Japanese cypress are sown on the soil surface, and tubers of Japanese cypress and Japanese cypress are sown. embedded. moreover
Three rice seedlings (variety name: Akinishiki) at the 2.5 leaf stage were planted at a depth of 2 cm. After that, the rice was submerged in water to a depth of about 3 cm, and grown in a glass room at 20 to 25°C, and 7 days after transplanting (when the rice plants were at about 0.8 leaf stage) and 14 days later.
A day later (when the wildflowers were at about the two-leaf stage), a wettable powder prepared according to Formulation Example 1 was diluted with water and sprayed in a predetermined amount. After that, they are grown in a glass room and treated with chemicals.
On the 21st day, the herbicidal effect and the chemical damage to paddy rice were investigated. The results are shown in Table 2. Weeding effect Paddy rice chemical damage weed suppression rate (%) -: Normal 5: 100 (complete withering) ±: Slight damage 4: 75-99 +: Slight damage 3: 50-74: Medium damage 2: 25-49 1: 1- 24 0:0 (no effect observed at all)

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【table】 [Brief explanation of the drawing]

FIG. 1 shows a 1H-NMR chart of N-substituted-chloroacetanilide obtained in Synthesis Example 1.

Claims (1)

[Claims] 1. The following general formula (However, in the formula, R ₁ , R ₂ and R ₃ are the same or different hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, alkylthio groups, alkoxyalkyl groups,
or represents an alkylthioalkyl group, R ₄ represents a hydrogen atom or an alkyl group, and R ₅ , R ₆ and R ₇ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, alkenyl groups, alkynyl groups, alkoxy groups, or Indicates an alkylthio group. ) and the following general formula: (However, in the formula, R ₈ and R ₉ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, or alkoxy groups, and R ₁₀ represents hydrogen atoms, alkyl groups, or different hydrogen atoms, halogen atoms, alkyl algae, or alkoxy R ₁₁ , R ₁₂ and R ₁₃ represent the same or different hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, hydroxysulfonyloxy groups, alkylsulfonyloxy groups, carboxylic acid groups, or esters thereof. , Y represents an oxygen atom or an alkylene group, Z represents a nitrogen atom or a methine group, and n represents 0 or 1) as an active ingredient. Composition.