732-11-6
Phosmet
CAS: 732-11-6
Molecular Formula: C11H12NO5PS
732-11-6 - Names and Identifiers
732-11-6 - Physico-chemical Properties
| Molecular Formula | C11H12NO5PS |
| Molar Mass | 301.26 |
| Density | 1.03 g/cm3 |
| Melting Point | 72.5°C |
| Boling Point | 412.6±47.0 °C(Predicted) |
| Flash Point | >100 °C |
| Water Solubility | 25 mg l-1 (25°C) |
| Vapor Presure | 6.5×10-5 Pa (25°C) |
| Storage Condition | 2-8°C |
| Physical and Chemical Properties | The pure chemical products are white odorless crystals; the industrial products are light yellow solids with a special stimulating taste. M. p.72.5 ℃, refractive index n28D1.5959, vapor pressure 1.33 × 10-1Pa (50 ℃). The solubility in organic solvent at 25 ℃ is: acetone 650g/L, benzene 600g/L, toluene 300g/L, xylene 250g/L, methanol 50g/L, kerosene 5g/L; The solubility in water is 22mg/L. It is easy to hydrolyze in case of alkali and high temperature, and is slightly corrosive. |
| Use | Uses of organic phosphorus insecticides, acaricides, for the control of rice Chilo suppressalis, cotton bollworm, cotton red spider and health pests and livestock parasites |
732-11-6 - Risk and Safety
| Risk Codes | R21/22 - Harmful in contact with skin and if swallowed. R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S22 - Do not breathe dust. S36/37 - Wear suitable protective clothing and gloves. S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 2811 |
732-11-6 - Upstream Downstream Industry
| Raw Materials | Benzyl chloride Ammonium bicarbonate Phosphorus pentasulfide Dimethyl sulfide formaldehyde Phthalimide Dimethoate Phthalic acid Dimethylphosphorodithioate Sodium thiophosphate |
732-11-6 - Nature
| storage conditions | 0-6°C |
| acidity coefficient (pKa) | -2.63±0.20(Predicted) |
| water solubility | 25 mg l-1 (25°C) |
| morphology | solid |
| BRN | 264869 |
| NIST chemical information | Phosmet(732-11-6) |
| EPA chemical information | Phosmet (732-11-6) |
Last Update：2024-04-10 22:29:15
732-11-6 - Uses and synthesis methods
Toxicity
the acute oral LD50 of rats is 147 mg/kg (the original drug is 230~299 mg/kg), the acute oral LD50 of rats is 34 mg/kg, and the acute oral LD50 of mice is 45 mg/kg. Acute percutaneous LD50>3160ng/kg in rabbits and> 1000mg/kg in mice. The chronic non-effective dose of rats and dogs is 40mg/kg. Medium toxicity to fish, carp LC50 is 5.3mg/L. LD50 for bees is 18.1 μg/bee.
use
Broad-spectrum organophosphorus insecticides have contact and stomach toxicity effects, and have certain permeability to plant tissues. Used for rice, cotton, fruit trees and other crops. It can control cotton bollworm, cotton red spider, red bollworm, rice leafhopper, rice planthopper and rice leaf roller. It uses 25% emulsifiable concentrate 22.5~30mL/100 m2 and sprays 7.5~11.3kg of water. To control cotton aphid and vegetable aphid, spray 7.5~11.3kg of water with 25% emulsifiable concentrate of 7.5~15mL/100 m2. Control apple spider mites and citrus scale insects, spray with 25% emulsifiable concentrate 600~1000 times. To control cutworm, control is carried out at the 3rd instar of larvae, diluted with 25% emulsifiable concentrate and water to 250 times burn roots.
production method
1. It is prepared by the reaction of O,O-dimethyldithiophosphate and chloromethylbenzenediimide. The preparation method of the intermediate chloromethylbenzeneimide: The phthalic acid and 20% ammonia are slowly heated, and a large amount of water evaporates when the temperature rises to 110-120 ℃. The reactant is treated with hot water to obtain white crystalline phthalimide, which is heated and refluxed with 12% formaldehyde aqueous solution for 2.5h, cooled, filtered, washed, and dried to obtain hydroxymethylbenzeneimide, and then chlorinated in toluene with 30-36% hydrochloric acid, and kept at 60 ℃ for 2h to obtain chloromethylbenzeneimide. Raw material consumption quota: phthalic anhydride (99%)700 kg/t, ammonia water (25%)420 kg/t, methanol (99.5%)350 kg/t, formaldehyde (30%)500 kg/t, hydrochloric acid (36%)1230 kg/t, sodium bicarbonate 370 kg/t, phosphorus pentasulfide 560 kg/t, benzene 200 kg/t.
2. Preparation of phthalimide phthalic anhydride and ammonium bicarbonate are used to prepare phthalimide (amide for short). The ratio is phthalic anhydride: ammonium bicarbonate = 1:1.5 (mol); The reaction temperature is 280~300 ℃; The operation period is 6 hours.
Preparation of N-hydroxymethylbenzenediimide; N-hydroxymethylbenzenediimide (hydroxyl compound for short) is prepared by the action of imide and formaldehyde. The raw material ratio is amide: toluene = 1:1.1, reaction temperature 98~100 ℃, heating time 1.5h, reaction time 3h, operation cycle 6~7h.
Preparation of chlorinated methylbenzimide hydroxylates react with hydrochloric acid to produce chloromethylbenzimide (chloride for short). The raw material ratio is hydroxyl compound: hydrochloric acid & asymp;1:6.6, heating time 40~50min, reaction temperature (60±2)℃. The temperature of benzene addition is 55~58 ℃, the content of hydrochloric acid is 35%, and the operation period is 6h.
O,O-xylene thiophosphate sodium salt preparation details of dimethoate preparation method.
Synthesis of Imithion O,O-dimethylthiophosphate sodium reacts with chloromethylbenzimide to produce Imithion. The ratio of raw materials is hydroxyl compound: sodium salt = 1:1.01, reaction temperature 50 ℃, heating time 30min, reaction time 2h, pH value of reaction medium 5~7, operation cycle 4~6h.
category
Pesticides
toxicity classification
highly toxic
acute toxicity
oral-rat LD50: 92.5 mg/kg; oral-mouse LD50: 26 mg/kg
flammability hazard characteristics
Thermal decomposition of toxic phosphorus oxide, sulfur oxide, nitrogen oxide gas
storage and transportation features
The warehouse is ventilated and dry at low temperature; stored and transported separately from food raw materials
fire extinguishing agent
Sand, dry powder, foam
Last Update：2024-04-10 22:29:15
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Multiple SpecificationsSpot supply
Product Name: Phosmet in acetone Visit Supplier Webpage Request for quotationCAS: 732-11-6
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
Wechat: 18301782025
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