KR100419853B1 - Optically active herbicidal (R)-phenoxypropionic acid-N-methyl-N-2-fluorophenyl amides - Google Patents

Abstract

The present invention provides a photoactive (R) -phenoxypropionic acid-N-methyl-N-2-fluorophenylamide compound represented by the following Chemical Formula 1, a method for preparing the same, and a use for controlling blood generated in rice farming, including these compounds It relates to a herbicide composition.

In Formula 1, X, Y and n are as defined in the detailed description of the invention, respectively.

Description

Optically active herbicidal (R) -phenoxypropionic acid-N-methyl-N-2-fluorophenyl amides}

The present invention provides a photoactive (R) -phenoxypropionic acid-N-methyl-N-2-fluorophenylamide compound represented by the following Chemical Formula 1, a method for preparing the same, and a use for controlling blood generated in rice farming, including these compounds It relates to a herbicide composition.

Formula 1

In Formula 1 above:

X is an alkyl group of a hydrogen atom, a halogen atom, a hydroxy _{group, NH 2, CO 2 H,} C 1 ~C ₃ alkyl group is of one or two substituted C ₁ ~C ₆ alkyl _{group, C 1 ~C 6, C 1} ~ C ₆ alkoxy group, C ₁ -C ₃ haloalkyl group, C ₁ -C ₃ haloalkoxy group, C ₂ -C ₄ alkoxyalkoxy group, C ₁ -C ₄ alkylthio group, C ₁ -C ₄ alkyl sulfonic groups, alkoxy of C ₂ ~C ₆ alkenyl group, C ₂ ~C ₆ alkynyl group, an alkenyloxy group of C ₂ ~C _6, the alkynyloxy group of _{C 2 ~C 6, C 1 ~C} 3 carbonyl, or C ₁ ~C ₃ alkyl represents a carbonyl group; Y represents a hydrogen atom or fluoro (F); n represents an integer of 0, 1, or 2, and when n is 2, X may be a combination of different substituents.

US Patent No. 4,130,413 discloses a compound represented by the following formula (2).

In Formula 2, (R ₁ ) m is a hydrogen atom, a halogen atom, CF ₃ , NO ₂ , CN, an alkyl group, and the like; A is O, S, NH and the like; R ₂ is a hydrogen atom or an alkyl group; Z is among many (Wherein R ₃ and R ₄ are the same as or different from each other and are a hydrogen atom, a C ₁ -C ₆ alkyl group, a C ₁ -C ₆ hydroxyalkyl group, a C ₃ -C ₆ cycloalkyl group, a C ₁ -C ₄ alkoxy group, or It represents a C ₁ ~C ₄ alkyl group, C ₁ ~C ₆ alkoxy group, a will) substituted with 1 to 3 substituents selected from halogen and CF ₃ as a phenyl group.

US Patent No. 4,531,969 discloses a compound represented by the following formula (3).

In Chemical Formula 3: R ₅ is (Wherein R ₆ is a hydrogen atom, a halogen or the like, R ₇ is a hydrogen atom, an alkyl group or the like); Z is as defined above.

U.S. Patent 5,254,527 discloses a compound represented by the following formula (4).

In Formula 4, R ₅ and Z are as defined above, respectively.

Some of the compounds represented by Formula 1 according to the present invention are included within the general scope of the above patents, but the patents have not synthesized the compounds of Formula 1 or the specific herbicidal activity of these compounds has been tested.

Japanese Patent Laid-Open No. 2-11580 discloses a compound represented by the following formula (5).

In the formula (5): L represents a lower alkyl group, halogen atom, methoxy group, methoxyphenoxy group, benzyloxy group, methylthio group, methylvinyl group; n represents the integer of 0-2.

In addition to the above-described patents, Japanese Patent Laid-Open Nos. 53-40767 and 54-112828 also describe that phenoxypropionic acid-amide derivatives have herbicidal activity.

On the other hand, the present inventors have filed a patent for a phenoxypropionic acid-N-alkyl-N-2-fluorophenylamide compound having herbicidal activity represented by the following general formula (6) [International Patent Application Publication WO 2000/05956].

Currently, various herbicides have been developed and used, but weed, which is still the most problematic problem in paddy farming, is blood.

Therefore, the development of medicines that control blood effectively is the greatest wish for rice farmers. In particular, single herbicides treated after seedling transplanting do not effectively suppress the development of rice blood, and the rice blood is regenerated in the middle of growing rice, causing great damage to rice harvest. Blood from the paddy field has a significant effect on the yield of rice. For example, a decrease in rice yield is 2% for 1 week of blood per 1 m 2, and a 10% reduction in rice yield for 5 weeks of blood per 1 m 2. It is reported that at 10 weeks it is about 19%, and at 20 weeks it causes a decrease in rice yield of about 35%.

This phenomenon, despite the fact that a number of paddy herbicides have been known in recent years, the control of the blood of the discussion is still a big problem, and also the decisive factor in reducing the yield of rice, and also in the agricultural economics or pesticide industry The need for herbicides is very large.

The present inventors have studied to find herbicides that can effectively control the blood of these discussions, and in particular, the selective selection of the phenoxypropionic acid-N-alkyl-N-2-fluorophenylamide compound represented by the above formula (6) for a particular crop. Herbicide activity was studied. As a result, some of the derivatives represented by the formula (6) have (R)-or (S)-stereoisomers, and (R)-stereoisomers are compared with (S)-stereoisomers or mixtures of isomers. The present invention was completed by confirming that it has excellent stability against and excellent control against non-skin. The herbicidal activity of this (R) -stereoisomer is remarkably distinguished from conventional inventions.

Accordingly, an object of the present invention is to provide a photoactive herbicidal compound which exhibits excellent selectivity to rice and excellently controls paddy fields, which is a problem in rice farming.

The present invention is characterized by a photoactive (R) -phenoxypropionic acid-N-methyl-N-2-fluorophenylamide compound represented by the following general formula (1), which is extremely safe for rice and excellent in preventing activity.

Formula 1

In Chemical Formula 1, X, Y, and n are as defined above.

To illustrate the photoactive compound represented by the formula (1) according to the present invention in more detail as shown in Table 1.

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The photoactive compound represented by Chemical Formula 1 according to the present invention as described above combines the compound represented by Chemical Formula 8 with the compound represented by Chemical Formula 8 as shown in the following Scheme 1 by applying a conventional organic synthesis method Can be prepared by reaction.

In Scheme 1: X 'represents OH, Cl, Br, or phenoxy group; X, Y and n are as defined above, respectively.

In the production method according to Scheme 1, it is preferable to use a binder such as triphenylphosphine and an organic base such as triethylamine and pyridine, and the reaction temperature is maintained at a suitable temperature of 0 to 100 ° C., with a diluting solvent. After reacting in an inert solvent such as ethers such as tetrahydrofuran, ethyl acetate, acetonitrile, toluene, xylene, hexane, methylene chloride, carbon tetrachloride and dichloroethane, the product is evaporated solvent and the residue It can be obtained by separation and purification by chromatography method.

As another preparation method, the compound of Formula 1 may be obtained by alkylating the compound represented by Formula 9 with the compound represented by Formula 10, as shown in Scheme 2 below.

In Scheme 2: X ″ represents Cl, Br, I, benzenesulfonyloxy group, toluenesulfonyloxy group, methanesulfonyloxy group, or lower alkyl sulfate group; X, Y and n are as defined above, respectively.

The reaction according to Scheme 2 is preferably carried out in the presence of a strong base capable of extracting NH hydrogen of an anide, for example, a strong base such as NaOH, KOH, LiOH, NaH, n-BuLi, LDA, and the like. The reaction temperature is maintained in the range of −78 to 50 ° C., and an inert solvent that does not affect the reaction, such as ethers such as ethyl ether, dioxane, tetrahydrofuran, and a hydrocarbon solvent such as hexane, is preferable.

As another method, the compound of Formula 1 may be prepared by reacting the compound of Formula 11 with the compound of Formula 12 in the presence of a base, as shown in Scheme 3 below.

In Scheme 3: Y 'represents a halogen atom, alkylsulfonyloxy, haloalkylsulfonyloxy, benzenesulfonyloxy group, or toluenesulfonyloxy group; R, X, Y and n are as defined above, respectively.

In the production method according to Scheme 3, for example, a base of an alkali metal hydroxide such as sodium hydroxide and potassium hydroxide, an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkali metal such as sodium hydrogencarbonate and potassium hydrogencarbonate Inorganic bases such as bicarbonates, or organic bases such as triethylamine, N, N-dimethylaniline, pyridine, and 1,8-diazabicyclo [5,4,0] unde-7-cene.

In addition, if necessary, by adding a phase transfer catalyst such as tetra-n-butylammonium bromide and 18-crown-6 [1,4,7,10,13,16-hexaoctacyclooctadecane], a desired reaction is carried out. It can also be terminated quickly. The reaction may be carried out in the presence of one kind or two or more kinds of suitable solvents, if necessary. Examples of solvents that can be used include inert organic solvents such as ketones such as acetone; Aromatic hydrocarbons such as toluene, xylene and chlorobenzene; Aliphatic hydrocarbons such as petroleum ether and ligroin; Ethers such as diethyl ether, tetrahydrofuran and dioxane; Nitriles such as acetonitrile and propionitrile; Or amides such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone and the like can be used. The reaction temperature is any temperature range from 0 deg. C to reflux temperature at which the reaction proceeds, and is preferably in the range of 5 to 50 deg. Reaction time can be carried out for 1 to 24 hours to obtain the target product in a good yield.

As another preparation method, a photoactive compound represented by Formula 1 may be prepared by reacting a compound represented by Formula 13 with a compound represented by Formula 14 in the presence of a base, as shown in Scheme 4 below.

In Scheme 4: X, Y, Y 'and n are as defined above, respectively.

In the production method according to Scheme 4, for example, alkali bases include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkali metal carbonates such as sodium carbonate and potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate. Inorganic salts such as bicarbonates, or organic such as triethylamine, N, N-dimethylaniline, pyridine, picoline, quinoline, 1,8-diazabicyclo [5,4,0] unde-7-cene Bases are good.

If necessary, the reaction may be accelerated by adding a phase transfer catalyst such as tetra-n-butylammonium bromide and 18-crown-6 [1,4,7,10,13,16-hexaoctacyclooctadecane]. Can be.

The reaction may be carried out in an appropriate one or two or more diluent solvents as necessary. Examples of the solvent that can be used include ketones such as inert organic solvents such as acetone and butanone; Aromatic hydrocarbons such as benzene, toluene, xylene and chlorobenzene; Aliphatic hydrocarbons such as petroleum ether and ligroin; Ethers such as diethyl ether, tetrahydrofuran and dioxane; Nitriles such as acetonitrile and propionitrile; Or amides such as N, N-dimethylformamide, N, N-dimethyl acetamide and N-methylpyrrolidone. Reaction temperature is arbitrary temperature from 0 degreeC to the reflux temperature of a reaction solvent, Preferably it is 20-100 degreeC. The reaction time is somewhat different depending on the compound, but the reaction can be obtained in a good yield if the reaction for 1 to 24 hours.

Such a present invention will be described in more detail based on the following examples, but the present invention is not limited thereto.

Example 1: Synthesis of (S) -2-bromo-propionic acid-N- (2-fluorophenyl) -N-methylamide

(S) -2-bromopropionic acid (3.4 g, 0.022 mol) and 2-fluoroaniline (3 g, 0.024 mol) were dissolved in 50 mL of chloroform and the reaction was cooled to 0 ° C. A solution of dicyclohexylcarbodiimide (5 g, 0.024 mol) in 10 mL of CHCl ₃ was slowly injected using a syringe. The temperature of the reaction mixture was slowly raised to room temperature and then stirred at room temperature for 1 hour. The insoluble solid in the reaction mixture was filtered, and then the solid filtrate was washed twice with 20 mL of CHCl ₃ . The filtrate was distilled under reduced pressure and purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/3) to obtain 5 g of pure target product.

¹ H-NMR (CDCl ₃ ): δ 1.7 (3H, d), 3.24 (3H, s), 4.16 (0.7H, q), 4.34 (0.3H, q), 7.13-7.48 (4H, m)

Example 2: Synthesis of (R) -2- (4-hydroxyphenoxy) propionic acid-N- (2-fluorophenyl) -N-methylamide

(S) -2-bromopropionic acid-N- (2-fluorophenyl) -N-methylamide (18.2 g, 0.07 mol) with hydroquinone (7 g, 0.064 mol), K ₂ CO ₃ (10.54 g, 0.076 mol) and tetran-butylammonium bromide (1 g) were dissolved in 350 ml of acetonitrile and refluxed for 6 hours. After lowering the temperature of the reaction mixture to room temperature, the insoluble solids in the reaction mixture were removed by filtration, and the filtrate was distilled under reduced pressure and purified by column chromatography (eluent solvent: ethyl acetate / n-hexane = 1/2). 16 g of pure target product was obtained.

¹ H-NMR (CDCl ₃ ): δ 1.42 (3H, t), 3.25 (3H, s), 4.56 (1H, q), 6.5 to 7.4 (8H, m)

Example 3: Synthesis of (R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N- (2-fluorophenyl) -N-methylamide

(R) -2- (4-hydroxyphenoxy) propionic acid-N- (2-fluorophenyl) -N-methylamide (11.5 g, 0.04 mol) and 2,6-dichlorobenzoxazole (6.85 g, 0.036 mol), K ₂ CO ₃ (6 g, 0.043 mol) and tetra n-butylammonium bromide (1 g) were dissolved in 300 ml of acetonitrile and refluxed for 7 hours. After lowering the temperature of the reaction mixture to room temperature, the insoluble solids in the reaction mixture were removed by filtration, and the filtrate was distilled under reduced pressure and purified by column chromatography (eluent solvent: ethyl acetate / n-hexane = 1/3). 12.5 g of pure target product was obtained.

¹ H-NMR (CDCl ₃ ): δ 1.42 (3H, t), 3.3 (3H, s), 4.62 (1H, m), 6.8-7.4 (11H, m)

Example 4: Synthesis of (R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N- (2-fluorophenyl) amide

(R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid (346.7 mg, 1 mmol) was dissolved in 10 ml of tetrahydrofuran, followed by 2-fluoroaniline ( 111.12 mg, 1 mmol), triphenylphosphine (393.4 mg, 1.5 mmol), triethylamine (0.15 mL, 1 mmol) and CCl ₄ (1 mL) were added sequentially and refluxed for 8 hours. After the temperature was lowered to room temperature, the reaction mixture was acidified with 5% HCl, water was added, and extracted three times with ethyl acetate. The extracted organic solvent layer was dried over MgSO ₄ , distilled under reduced pressure, and then purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/4) to obtain 200 mg of pure target product.

m.p: 132-136 degreeC

¹ H-NMR (CDCl ₃ ): δ 1.7 (3H, d), 4.81 (1H, q), 7.05-7.45 (10H, m), 8.35 (1H, m), 8.5 (1H, br)

Example 5: Synthesis of (R) -2- [4- (6-Chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N- (2-fluorophenyl) -N-methyl amide

(R) -2- [4- (6-Chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N- (2-fluorophenyl) amide (100 mg, 0.24 mmol) in 10 ml of anhydrous After dissolving in tetrahydrofuran and lowering the temperature to 0 ° C., 60% NaH (10 mg, 0.24 mmol) and CH ₃ I (34 mg, 0.24 mmol) were added sequentially, followed by stirring at room temperature for 5 hours. To the reaction mixture was poured ice water, extracted three times with ethyl acetate, dried over MgSO ₄ , filtered, distilled under reduced pressure, and purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/2) to give 75 mg of pure target product. Got.

¹ H-NMR (CDCl ₃ ): δ 1.42 (3H, t), 3.3 (3H, s), 4.62 (1H, m), 6.8-7.4 (11H, m)

Example 6: Synthesis of (R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N- (2-fluorophenyl) -N-methyl amide

(R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid (346.7 mg, 1 mmol) was dissolved in 10 ml of tetrahydrofuran and then N-methyl-2- Fluoroaniline (125 mg, 1 mmol), triphenylphosphine (393.4 mg, 1.5 mmol), triethylamine (0.15 mL, 1 mmol) and CCl ₄ (1 mL) were added sequentially and refluxed for 12 hours. The reaction mixture was cooled to room temperature, acidified with 5% HCl, extracted with water and ethyl acetate. The extracted organic solvent layer was dried over MgSO ₄ , filtered, and evaporated under reduced pressure, and then purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/2) to obtain 100 mg of the pure target substance as an oil.

Example 7: (R) -2- [4- (6-Chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N-methyl-N- (2,4,5-trifluorophenyl) Synthesis of Amide

(R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid (0.693 g, 2 mmol) was dissolved in 15 mL of tetrahydrofuran and then N-methyl-2 , 4,5-trifluoroaniline (0.322 g, 2 mmol), triphenylphosphine (0.78 g, 2 mmol), triethylamine (0.4 mL) and CCl ₄ (2 mL) were added sequentially and refluxed for 18 hours. I let you. The reaction mixture was cooled to room temperature, acidified with 5% HCl, and extracted three times with ethyl acetate. The extracted organic solvent layer was dried over MgSO ₄ , filtered, and distilled under reduced pressure, and then purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/2) to obtain 250 mg of pure target product.

¹ H-NMR (CDCl ₃ ): δ 1.42 (3H, d), 3.2 (3H, s), 4.65 (1H, m), 6.6-7.4 (9H, m)

Example 8: of (R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N-methyl-N- (2,6-difluorophenyl) amide synthesis

(R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid (0.693 g, 2 mmol) with N-methyl-2,6-difluoroaniline (0.284 g , 2 mmol) was dissolved in 20 mL of tetrahydrofuran, triphenylphosphine (0.78 g, 2 mmol), triethylamine (0.42 mL), and CCl ₄ (2 mL) were added sequentially and refluxed for 16 hours. . The reaction mixture was cooled to room temperature, acidified with 5% HCl, and extracted three times with ethyl acetate. The extracted organic solvent layer was dried over MgSO ₄ , filtered, and distilled under reduced pressure, and then purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/2) to obtain 205 mg of pure target product.

¹ H-NMR (CDCl ₃ ): δ 1.4 (3H, d), 3.3 (3H, s), 4.62 (1H, q), 6.8 to 7.4 (10H, m)

Example 9: of (R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N- (2,4-difluorophenyl) -N-methyl amide synthesis

(R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid (0.693 g, 2 mmol) was dissolved in 15 mL of tetrahydrofuran and then N-methyl-2 , 4-difluoroaniline (0.284 g, 2 mmol), triphenylphosphine (0.78 g, 2 mmol), triethylamine (0.42 mL) and CCl ₄ (2 mL) were added sequentially and refluxed for 12 hours. . The reaction mixture was cooled to room temperature, acidified with 5% HCl, and extracted three times with ethyl acetate. The extracted organic solvent layer was dried over MgSO ₄ , filtered, and distilled under reduced pressure, and then purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/2) to obtain 230 mg of pure target product.

¹ H-NMR (CDCl ₃ ): δ 1.4 (3H, d), 3.2 (3H, s), 4.6 (1H, q), 6.6 to 7.2 (10H, m)

Example 10 (R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid-N-methyl-N- (2,3,6-trifluorophenyl) Synthesis of Amide

(R) -2- [4- (6-chloro-2-benzoxazolyloxy) -phenoxy] propionic acid (0.693 g, 2 mmol) was added to 6 mL of SOCl ₂ and refluxed for 2 hours. Excess thionyl chloride was removed by distillation under reduced pressure, 3 ml of anhydrous tetrahydrofuran was added thereto, and the reaction flask was kept in anhydrous tetrahydrofuran (10 ml) with N-methyl-2,3, A solution containing 6-trifluoroaniline (0.32 g, 2 mmol) and Et ₃ N (0.42 mL) was slowly added dropwise. The reaction mixture was stirred at 0 ° C. for 30 minutes, and then reacted at room temperature for 1 hour, and water was extracted three times with ethyl acetate. The extracted organic solvent layer was dried over MgSO ₄ , filtered, and distilled under reduced pressure, and then purified by column chromatography (eluent: ethyl acetate / n-hexane = 1/2) to obtain 240 mg of pure target product.

¹ H-NMR (CDCl ₃ ): δ 1.45 (3H, d), 3.25 (3H, s), 4.6 (1H, q), 6.7-7.4 (9H, m)

Examples 11-16

Prepared according to the preparation method of Example 10, but using the corresponding aniline compound instead of N-methyl-2,3,6-trifluoroaniline to synthesize a compound as shown in Table 2 below.

Formulation

When the compound of the present invention is used as a herbicide, it is formulated into various forms such as a hydrating agent, an emulsion, a granule, a powder suspension and a liquid by combining the compound of the present invention with a carrier, a surfactant, a dispersant, and an auxiliary agent commonly used in the preparation of agrochemicals. Use it. These formulations can be used directly and can be processed by dilution in appropriate media. The spray volume can be used from several hundred liters to several thousand liters per hectare (ha). The formulations may contain up to about 0.1% to 99% by weight of the active ingredient, with the surfactant in the range of about 0.1% to 20%, or the solid or liquid diluent in the range of 0% to 99.9% It may be. A summary of this is shown in Table 3 below.

The proportion of the active ingredient can be adjusted according to the application and it is sometimes necessary to use a larger proportion of the surfactant than the active ingredient, and it can be added in the preparation or used in tank mixing.

Highly absorbent diluents when using solid diluents are good for making wetting agents. The liquid diluent and the solvent should be stable without phase separation even at 0 ° C. All formulations are added with a small amount of additives to prevent antifoam cake, corrosion and microbial growth.

The method of making the composition is a conventional method, and the liquid preparation only needs to mix the components, and the fine solid composition may be mixed and ground in a hammer or a flow mill. Suspensions are compounded in a wet mill and granules are made by spraying an active substance onto the granular carrier.

Representative formulation preparation examples are as follows.

Formulation 1: Hydration

The following components were mixed thoroughly and mixed with the liquid surfactant sprayed onto the solid components. Grinding in a hammer mill brought the particle size to 100 μm or less.

20 wt% of a compound (Example 3 compound)

Dodecylphenol polyethylene glycol ether 2% by weight

Sodium Lignin Sulfonate 4 wt%

Sodium silicon aluminate 6% by weight

Montmorillonite 68% by weight

Formulation 2: Hydration

The following ingredients were mixed and ground in a hammer mill until the particle size was 25 μm or less and packaged.

80 wt% of a compound (Example 3 compound)

Sodium Alkyl Naphthalene Sulfonate 2 wt%

Sodium Lignin Sulfonate 2 wt%

3% by weight of synthetic amorphous silica

13% by weight kaolinite

Formulation 3: Emulsion

The following components were mixed and uniformly dissolved to give an emulsion.

30 wt% of a compound (Example 3 compound)

20% by weight of cyclohexanone

11% by weight of polyoxyethylene alkylaryl ether

Alkylbenzenesulfonate calcium 4% by weight

Methylnaphthalene 35 wt%

Formulation 4: granulation

The following components are mixed and ground uniformly, 20 parts by weight of water is added to 100 parts by weight of the mixture, mixed, processed into granules of 14 to 32 mesh using an extruder, and dried to form granules.

5 wt% of a compound (Example 3 compound)

Sodium lauryl alcohol sulfate ester salt 2% by weight

Sodium lignin sulfonate 5% by weight

2% by weight of carboxymethyl cellulose

Potassium Sulfate 16% by weight

Gypsum 70% by weight

In actual use, the formulations of the present invention are diluted and applied at appropriate concentrations.

[Usage]

The compound of the present invention is particularly useful for rice farming because it exhibits high selectivity to rice during foliage treatment, and at the same time has excellent effect on controlling young and grown blood.

The herbicide of the present invention can be used as an active ingredient up to 10 g to 4 kg per hectare (ha), preferably using about 50 g to 400 g. The choice of dosage is determined by factors such as weed generation, growth level, and preparation. In addition, the herbicide of the present invention can be used alone or in combination with other herbicides, insecticides or fungicides. Especially bentazone, quinclolac, furofanyl, cetmethrin, 2,4-D, phenoxapuroethyl, linyuron, MCPA, azaphenidine, carfentrazone, molinate, thiobencarb, pendimethalin, Bensulfuronmethyl, pyrazosulfuronethyl, metsulfuronmethyl, thifensulfuronmethyl, tribenuronmethyl, trifluurine, amidosulfuron, brooxynyl, butaclo, mecofurop, metreuxin, biphenox, ben Mixed with one or more agents such as purazate, isopururoron, thihalopopbutyl, mefenacet, pentrazamide, pyriminobac methyl, bispyribac sodium, azisulfuron, cyclosulfamuron, peanker and the like It is also useful to use.

The following describes an example of testing the weed control effect exhibited by the compounds of the present invention.

Test Example 1: Foliage Treatment Test

Soil-filled 600 cm 2 pots were planted with seeds of each plant, such as rice, wheat, barley, corn, cotton, blood, sorghum, and barley, and covered with 0.1-1 cm. Pot is dissolved in a mixture of 1 part by weight of the test agent, 5 parts by weight of acetone and 1 part by weight of emulsifier when grown in a greenhouse at 20 to 30 ℃, and diluted with water. 2000 L per hectare (ha) The plant foliage surface was sprayed at a ratio of. The amount of active compound was chosen to be the specific amount desired. The efficacy study assessed the percent damage by visually comparing the degree of damage of the plant with the control group not treated with the drug on the 14th day after treatment. Evaluation values are shown as follows.

0% invalid and equivalent to no medication

20% slight effect

70% herbicidal effect

100% annihilation (completed test)

As a result of the experiment, the photoactive compound represented by Chemical Formula 1 according to the present invention showed high selectivity in crops and strong weeding effect in weeds.

The plant names used in this test are shown in Table 4 below.

Test Example 2:

Rice (estimated rice) and blood (bark and bark) were sown and grown in dry condition.

Test compounds having a purity of at least 98% were dissolved in acetone solution mixed with Tween-20 and diluted in water. At this time, the final concentrations of acetone and tween-20 were 25% and 0.1%, respectively. The prepared solution was foliage treated to a level of 200 g a.i / ha using an atomizer. The growth of crops and weeds during the foliage treatment was 6.0-6.5 leaves in rice, 32.8 cm in height, 1-2 minutes in bark, 37.3 cm in bark, and 1-2 minutes in bark. This was 44.4 cm.

On the 20th and 30th days after drug treatment, drug efficacy and harm were examined by the 0-100% grade table (0: no activity, 100%: all deaths).

As described above, it can be seen that the (R) -photoactive compound according to the present invention has excellent selectivity and non-pig control titer for rice compared to the isomer mixture or the (S) -photoactive compound. Therefore, the excellent skin-proofing effect of the photoactive compound according to the present invention increases the utility particularly in rice farming. In addition, since the photoactive compound according to the present invention shows high safety in wheat, barley, soybeans and corn, it is also useful for weed control in agriculture other than rice farming.

Claims (7)

A photoactive (R) -phenoxypropionic acid-N-methyl-N-2-fluorophenylamide compound represented by the following formula (1), characterized in that the stability against rice and the control effect against paddy fields are excellent. Formula 1 In Formula 1 above: X is an alkyl group of a hydrogen atom, a halogen atom, a hydroxy _{group, NH 2, CO 2 H,} C 1 ~C ₃ alkyl group is of one or two substituted C ₁ ~C ₆ alkyl _{group, C 1 ~C 6, C 1} ~ C ₆ alkoxy group, C ₁ -C ₃ haloalkyl group, C ₁ -C ₃ haloalkoxy group, C ₂ -C ₄ alkoxyalkoxy group, C ₁ -C ₄ alkylthio group, C ₁ -C ₄ alkyl sulfonic groups, alkoxy of C ₂ ~C ₆ alkenyl group, C ₂ ~C ₆ alkynyl group, an alkenyloxy group of C ₂ ~C _6, the alkynyloxy group of _{C 2 ~C 6, C 1 ~C} 3 carbonyl, or C ₁ ~C ₃ alkyl represents a carbonyl group; Y represents a hydrogen atom or fluoro (F); n represents an integer of 0, 1, or 2, and when n is 2, X may be a combination of different substituents. The method of claim 1, wherein the compound represented by Formula 1 is X is H, F, Cl, Br, CN, CH ₃ , or OCH ₃ ; Y is H, or F; n = 1 photoactive compound. The method of claim 1, wherein the compound represented by Formula 1 is X is H; Y is H photoactive compound, characterized in that. According to claim 1, wherein the compound represented by Formula 1 is X is 5-CH ₃ ; Y is H photoactive compound, characterized in that. According to claim 1, wherein the compound represented by Formula 1 is X is 4,5-F ₂ ; Y is H photoactive compound, characterized in that. Next, a method of spraying an effective amount of a photoactive compound represented by the following formula (1) to control blood generated in a paddy field in which rice is grown without causing substantial damage to rice. Formula 1 In Formula 1, X, Y and n are as defined in claim 1, respectively. Next, the herbicidal composition for controlling nappy skin comprising a photoactive compound represented by Formula 1 and a carrier, an adjuvant, a surfactant, or another herbicide compound which can be used agriculturally. Formula 1 In Formula 1, X, Y and n are as defined in claim 1, respectively.