Rimsulfuron CAS 122931-48-0

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Rimsulfuron is an organic compound, CAS 122931-48-0, The chemical formula is C14H17N5O7S2. The pure product is a white crystalline solid. Stable in neutral soil and easily degradable in acidic or alkaline soil. This product is a sulfonylurea herbicide, a branched chain amino acid synthesis inhibitor, and a selective post emergence herbicide. The acute oral LD50 of rats is greater than 5g/kg, and the acute dermal LD50 of rabbits is greater than 2g/kg. Mild irritation to rabbit eyes, no irritation to skin, and no allergy to guinea pig skin. It is an efficient herbicide. Its unique chemical structure can effectively inhibit the growth of weeds while being safe and harmless to crops. In agricultural production, sulfometuron is widely used to control annual and perennial weeds, helping farmers increase crop yields.

Rimsulfuron, with the chemical formula C14H17N5O7S2, is an important sulfonylurea herbicide that has been widely used in agriculture worldwide since its successful development by DuPont in the mid-1980s. With its high selectivity, efficiency, and low toxicity, it has become an important choice for weed control in corn fields, and has also shown broad application prospects in other crops and fields.

The use of sulfometuron methyl

 

Mainly used in the agricultural field, as an systemic conductive herbicide, it inhibits the biosynthesis of branched chain amino acids by suppressing acetyl lactate synthase (ALS) in weeds, thereby inhibiting cell division, leading to weed growth arrest, chlorosis, leaf blight, and even death. Its high selectivity and efficiency make it an ideal choice for weeding crops such as corn, potatoes, and tobacco.

Weeding in corn fields

 

It has significant control effects on annual or perennial gramineous and broad-leaved weeds in corn fields, such as thistle, shepherd's purse, fragrant aconite, wrinkled leaf acid mold, Arabic sorghum, wild oats, hemostatic horsetail, barnyard grass, multi flowered ryegrass, grasshopper, amaranth, pigweed, corn poppy, and bamboo shoots. The recommended dosage is 5-15 grams of active ingredient per hectare, and the best application is during the early 2-5 leaf stage after the emergence of weeds in the 2-4 leaf stage of corn. At this point, it can be rapidly absorbed by the roots and stems of weeds, and transmitted to the meristematic tissue within the plant, thus achieving the best weed control effect.

Application example:
In the Northeast region, farmers often mix it with herbicides such as Atractylodes macrocephala or Thiamethasone (Thiamethasone) to expand the weed killing spectrum and improve the control effect on broad-leaved weeds such as quinoa and Polygonum. The specific formula is: 5 g of 25% sulfuron methyl, 120 ml of 38% atrazine, 60 ml of surfactant, and 30 l of water for spray per mu; Or use 5 g of 25% sulfuron methyl and 0.7 g of 75% thiofenuron methyl plus 60 ml of surfactant per mu to spray 30 liters of water.

Weeding in potato fields

 

It can also be used for spraying pesticides on weeds during the 2-4 leaf stage after potato sowing, before or after seedling emergence, effectively preventing and controlling weeds such as Atractylodes macrocephala, Chenopodium chinense, Polygonatum sibiricum, Caryophyllum multiflorum, Amaranthus retroflexus, Elsholtzia cocos, Echinochloa crus, Echinochloa crus, Scutellaria baicalensis, Echinochloa crus, Echinochloa crus, Portulaca oleracea, Asparagus fragrans, Thalassia spicata, Abutilon, and Cirsium.

Its systemic transmission allows the medicinal solution to be absorbed by weed roots and stems, and quickly transmitted to the entire plant, achieving a comprehensive weed control effect.

Application example:
When weeding potato fields, use 70~120g of 25% sulfuron ethyl dry suspension agent per mu, and add 30~50kg of water to spray. This formula can effectively prevent and control various weeds in potato fields, and is safe and harmless to potatoes.

Weeding in tobacco fields

 

In the early stage of flue-cured tobacco clumping (42 days after transplanting), in the 5-9 leaf stage of gramineous grass and in the 5-10 leaf stage of broad-leaved weeds, 15 g/ha of effective ingredient of 25% sulfsulfuron ethyl dry suspension agent is applied to stem and leaf spray treatment, which has good control effect on such weeds as crabgrass, barnyard grass, self-produced wheat, horseradish grass, broken rice sedge, cowweed, lotus bean grass, chenopodium album, amaranth, dayflower, amaranthus communis, amaranthus majus, polygonum hydropiper, polygonum nepalense, shepherd's purse, wild pea, and swainsonis. Selectivity enables it to effectively control weeds in tobacco fields without harming tobacco crops.

Application example:
When weeding tobacco fields, 15 grams of effective ingredients of 25% sulfuron ethyl dry suspension agent should be sprayed spray 30 liters of water per mu. This formula can comprehensively control weeds in tobacco fields, improve tobacco yield and quality.

Weeding in other crop fields

 

It is also applied in crop fields such as chili and sweet potato fields. Mixing with Quinquefolin or Ketone can improve the ability to eradicate weeds in the Poaceae family, and has good control effects on common broad-leaved weeds such as Aconitum carmichaelii, Amaranthus asiatica, and Portulaca oleracea. Its flexible application and wide weed control spectrum make it the preferred weed control solution for various crop fields.

Application example:
When weeding pepper fields, use 5 g of 25% sulfuron ethyl dry suspension agent plus a proper amount of quinoxaline or enochlor per mu, and add 30 liters of water to spray. This formula can effectively prevent and control grass weeds and broad-leaved weeds in chili fields, improving the yield and quality of chili peppers.

Production method of Rimsulfuron:

It is prepared by the reaction of 3 - (ethanesulfonyl) - 2-pyridinesulfonamide with 4,6-dimethoxy-2-pyrimidine carbamate phenyl ester.

① Synthesis of thioether. Main raw materials: chloroacetonitrile, ethanethiol, alkali, water

② Synthesis of sulfone nitrile. Main raw materials: sulfur ether, hydrogen peroxide, acetic acid and catalyst from the first step

③ Synthesis of pentadienonitrile. Main raw materials: sulfononitrile, tetramethoxypropane, acetic acid and catalyst from the second step

④ Synthesis of bromopyridine salt. Main raw materials: pentadienonitrile solution, water and bromination reagent from the third step

⑤ Synthesis of mercapto compounds. Main raw materials: Bromopyridine salt, water, acid, alkali, sodium hydrosulfide, sulfur

⑥ Synthesis of sulfonamide. Main raw materials: mercapto compound, salt, chlorine, ammonia, sodium sulfite and solvent from the fifth step

⑦ Synthesis of carbamate. Main raw materials: pyrimidine amine, carbamate, acid binding agent, solvent, sulfuric acid

⑧ Product synthesis. Main raw materials: products of steps ⑥ and ⑦, triethylamine, hydrochloric acid, acetonitrile

Action characteristics and herbicide spectrum of rimsulfuon:

It is used to control annual or perennial gramineous and broad-leaved weeds in corn fields, such as thistle, shepherd's purse, aconite, rumex plicata, sorghum arabicum, wild oats, hemostatic crabgrass, barnyard grass, perennial ryegrass, abutilon, retrorse branch amaranth, Sargassum esculentum, Yumeiren, and Fanzhou. It is especially good for early use after sprouting of annual miscellaneous grass, and the recommended dosage is 5~15g of active ingredient/hm. Used for weeding corn and potato; It is safe for corn and the safest for spring corn. The half-life of sulfurosulfuron methyl in corn is only 6h, and corn is still safe when treated with 2-4 times of the recommended dosage. In the corn field, the recommended dosage is 5~15g (a.i.)/hm2 [0.33~1.09 (a.i.) per mu]. When used, it has no adverse effect on the following crops, but sweet corn, popcorn, sticky corn and seed production fields should not be used.

Rimsulfuron is a sulfonylurea herbicide that inhibits cell division and plant growth by suppressing the activity of plant acetyl lactate synthase (ALS) and blocking the synthesis of branched chain amino acids such as valine, leucine, and isoleucine. Its broad-spectrum herbicidal activity makes it widely used for weed control in crops such as corn and tomato fields. However, with the expansion of its scope of use, its potential adverse reactions to non target organisms (including humans, animals, and environmental microorganisms) have gradually received attention.

Oral toxicity

 

Rimsulfuron has low acute oral toxicity. The oral median lethal dose (LD50) for rats is>5000 mg/kg, indicating that its oral acute toxicity belongs to the low toxicity category. However, high-dose intake may cause gastrointestinal irritation symptoms such as nausea, vomiting, and diarrhea. Although the specific mechanism is not yet clear, it may be related to the direct stimulation of gastrointestinal mucosa by drugs or the toxic effects of metabolites.

Skin contact toxicity

 

Skin contact usually does not cause significant irritation, but long-term or repeated contact may lead to redness and itching of the skin. Animal experiments have shown that rimsuluron is non allergenic to the skin, meaning it does not cause allergic reactions. However, in practical use, operators still need to wear protective gloves and clothing to avoid direct skin contact and reduce potential irritation risks.

Eye contact toxicity

 

Rimsulfuron has moderate irritation to the eyes and may cause conjunctival congestion, tearing, and pain. Animal experiments have shown that after rimsuluron is dropped into the eyes, a significant eye irritation response can be observed, but it usually does not cause permanent damage. However, goggles should be worn during operation to prevent medication from splashing into the eyes.

Inhalation toxicity

 

Rimsulfuron has low inhalation toxicity, but long-term exposure to high concentrations of dust or aerosols may cause respiratory irritation such as coughing and difficulty breathing. In animal experiments, the median lethal concentration (LC50) of rimsuluron inhaled by rats for 4 hours was>5200 mg/m ³, indicating that its acute inhalation toxicity belongs to the low toxicity category. However, during pesticide formulation and spraying, it is still necessary to operate in a well ventilated environment and wear dust masks to reduce inhalation risks.

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