Molecular Formula | C15H21NOS |
Molar Mass | 263.4 |
Density | 1.0766 (rough estimate) |
Melting Point | 39℃ |
Boling Point | 166 °C |
Appearance | morphology neat |
pKa | -1.24±0.20(Predicted) |
Storage Condition | 0-6°C |
Refractive Index | 1.7500 (estimate) |
Physical and Chemical Properties | Nature Pacaodan is also known as Barnyard Net and Youke Barnyard. Organic heterocyclic endogenous and selective herbicides. Pimazone is slightly soluble in water, easily soluble in various organic solvents, stable to light, stable in 0.1cmol/kg hydrochloric acid and 0.1cmol/kg caustic soda aqueous solution. |
Use | Application of piperidone has special effects on Humulus scandens, can be absorbed by the root and stem and leaf conduction to the whole plant. Piperidone is a plant endogenous auxin antagonist, breaking the balance of endogenous auxin, so that protein synthesis is blocked, the growth point cell division is blocked, and the growth is stopped. It is suitable for rice seedling field, transplanting field and direct-seeding field, and can be used to control Humulus scandens and tomentosa. |
Risk Codes | R22 - Harmful if swallowed R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
Safety Description | 61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
UN IDs | UN3082 9/PG 3 |
WGK Germany | 3 |
RTECS | TM5958000 |
HS Code | 29333990 |
Toxicity
piazodan has low toxicity to humans and animals, with acute oral LD50 ranging from 946 to 959mg/kg to rats, acute percutaneous LD50>5000mg/kg to rats, and acute inhalation of LC50>1.66mg/L to rats. Pisopan is moderately toxic to aquatic animals and low toxicity to poultry.
chemical properties
It looks like a waxy solid. M. p.38.8 ~ 39.3 ℃, B. p.164 ~ 168 ℃/99.75Pa, vapor pressure 0.53 × 10-3Pa (30 ℃), relative density 1.08 (25 ℃). The solubility in organic solvent at 25 ℃ is: n-hexane 2.0kg/L, toluene 3.1kg/L, ethanol 4.1kg/L, cyclohexanone 4.9kg/L, chloroform 5.8kg/L, acetone 6.2kg/L; The solubility in water is 20mg/L. It can be stable at 30 ℃ for more than 1 year, stable in 0.1mol/L hydrochloric acid and 0.1mol/L sodium hydroxide aqueous solution, and stable in sunlight.
use
Internal absorption conduction selective rice field herbicides. The effect on the control of barnyard grass before the 2 leaf stage is outstanding. The agent is absorbed by the root system, stem, and leaf and then conducted to the entire plant, breaking the balance of endogenous auxin, which in turn hinders the protein synthesis in the cell, destroys the cell division at the growth point, and inhibits and delays the formation of weed stems and leaves. The growth and development are stopped, and the stems and leaves change from dark green to yellow, brown to dead. For example, after the emergence of rice in a dry farming field, barnyard grass 1.5 to 2.5 leaves, 30mL of piperidopalum 50% emulsifiable concentrate plus 75~112.6mL of 20% dipteryx emulsifiable concentrate per 100 square meters, 4.5~6kg of water, and spray the stems and leaves. Dry-raised seedlings and wet seedlings are sprayed with 22.5~30mL of 50% emulsifiable concentrate per 100 square meters before or after sowing, and 3.75~4.5kg of water is sprayed on the bed surface. Water-raised seedlings can be applied with toxic soil method 1~4 days after sowing. 3~7 days after transplanting, spray water with 22.5~39mL 50% emulsifiable concentrate. After application, the 3 ~ 5cm water layer was kept for 5 ~ 7d. When there are many kinds of weeds in rice fields, it should be mixed with other herbicides.
production method
Using toluene or piperidine as solvent, add α,α-dimethylbenzyl mercaptan, and then add 40% sodium hydroxide solution dropwise at room temperature, reflux reaction, and remove water. Raise the temperature to 60~70 ℃, add piperidinoyl chloride dropwise, filter out the precipitated sodium chloride, heat up and react for several hours, wash, dry, and desoluate depipidan.
The synthesis method of α,α-dimethylbenzyl mercaptan is as follows: Using 1,4-dioxane as solvent, in the presence of a catalyst, α-methylstyrene is prepared by reacting with hydrogen sulfide, and the yield is 86.3%.
dimethyl sulfoxide can also be used as solvent, the corresponding nitro compound is treated with Na2S2, and the obtained product is prepared by reacting with aluminum amalgam at 0 ℃, with a yield of 92%.
category
Pesticides
toxicity classification
Poisoning
acute toxicity
oral-rat LD50: 946 mg/kg; oral-mouse LD50: 4519 mg/kg
flammability hazard characteristics
Combustion produces toxic nitrogen oxides and sulfur oxide gases
storage and transportation features
The warehouse is ventilated and dry at low temperature; stored and transported separately from food raw materials
fire extinguishing agent
Dry powder, foam, sand