Pyriproxyfen CAS 95737-68-1, Pyriproxyfen, CAS 95737-68-1
Using p-hydroxydiphenyl ether as the raw material, through condensation with propylene oxide → condensation with 2-chloropyridine, the total yield is ≤43% (with many by-products and waste alkali pollution).
95737-68-1
C20H19NO3
321.37
429-800-1
| CAS | 95737-68-1 |
| Molecular formula | C20H19NO3 |
| Molecular weight | 321.37 |
| EIENCS | 429-800-1 |
| Form | neat |
| Melting point | 45-47°C |
| boling point | 230-250 °C |
| Density | 1.32 |
| Solubility | 0.4 mg l-1 (25 °C) |
| PKA | 3.2 (base, est.) |
| Color | / |
| Storage temp | 0-6°C |
Molecular formula and structure
Molecular formula: C₂₀H₁₉NO₃
Molecular weight: 321.37 g/mol
Structure: It contains phenoxy phenyl and pyridyloxypropyl ether structures and is an analogue of juvenile hormones.
Appearance: Light yellow to off-white crystalline powder, prone to oxidation and yellowing under light (should be stored away from light).
Innovation in synthetic technology
Defects of the traditional route
Using p-hydroxydiphenyl ether as the raw material, through condensation with propylene oxide → condensation with 2-chloropyridine, the total yield is ≤43% (with many by-products and waste alkali pollution).
Green Process Breakthrough (Patent in 2024)
New route: p-chlorophenol + propylene oxide → chlorophenoxypropanol → phenol substitution → crystallization purification (yield > 85%).
Advantages: No phase transfer catalyst, isomer impurities less than 1%, cost reduction by 30%.
1. Agricultural pest control
Key applications：
Whiteflies/scale insects：Spray with 10% emulsifiable concentrate at a dilution of 1000 to 1500 times. The residual effect lasts for ≥30 days (the control effect on citrus red wax scale insects is > 95%).
Thrips/diamondback moth：Compound pesticides (such as 30% pyripropyl · fenacitrile suspension 20ml/ mu).
Compound scheme：
| Compound ingredients | Proportion | Advantage |
|---|---|---|
| Ethyl spiroworm | 1:1–1:3 | Work together to control whiteflies and delay resistance |
| Bifenthrin | 10%:2% | Expand the insecticidal spectrum and enhance the rapidity |
| Cyanofuron hydrazone | 1:1–1:10 | Lepidoptera larva special effect |
2. Control of sanitary pests
Dosage form and usage：
| Dosage form | Usage | Effect |
|---|---|---|
| 0.5%Granule | Apply 20g/m² to sewage ponds/landfills | Inhibit mosquito and fly pupation (emergence rate ↓ > 90%) |
| 5%Microemulsion | Residual spraying of cockroach breeding grounds | Block the development of nymphs |
Contribution to public health：Used for vector control of Zika virus (South America).
Mammalian toxicity
Acute oral LD₅₀ : rats > 5000 mg/kg (low toxicity).
Chronic effects: No teratogenicity/mutagenicity. The non-action dose for 6 months is 400 mg/kg.
Environmental risk
Aquatic organisms: Highly toxic to fish (LC₅₀ < 1 mg/L), prohibited in areas near water sources.
Ecological protection: Safe for beneficial insects such as bees and ladybugs.
Operating Specifications
Protection: Wear gloves/goggles to avoid skin contact (risk of eye irritation).
Disposal: Dispose of as hazardous waste (S60 safety mark).
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