Ethyl butylacetylaminopropionate

Ethyl Butylacetylaminopropionate (CAS No. 52304-36-6) 

1. Basic Information

Chemical Name: Ethyl 3-(butylacetamido)propanoateINCI Name: Ethyl butylacetylaminopropionateTrade Names: IR3535®, Merck Insect RepellentCAS Number: 52304-36-6Molecular Formula: C₁₁H₂₁NO₃Molecular Weight: 215.29 g/molAppearance: Colorless to pale yellow liquidOdor: Mild, characteristic ester-like odor

2. Physical and Chemical Properties

Boiling Point: ~300°C (572°F) (decomposes)Density: 0.998–1.008 g/cm³ at 20°CRefractive Index: 1.442–1.447 at 20°CSolubility:Water: Slightly soluble (~1.2 g/L at 25°C)Organic solvents: Miscible with ethanol, propylene glycol, oilsFlash Point: >100°C (>212°F) (non-flammable)Vapor Pressure: <0.01 hPa at 20°C

3. Chemical Structure

       O        ║  CH₃-CH₂-C-NH-CH₂-CH₂-COO-CH₂-CH₃        |       CH₂        |       CH₂        |       CH₃

4. Hazards (GHS Classification)

Acute Toxicity: Not classified (LD50 >2,000 mg/kg oral, rat)Skin Irritation: Non-irritating (OECD 404 tested)Eye Irritation: Mild irritant (Category 2B)Environmental Impact: Readily biodegradable (OECD 301)

5. Storage and Handling

Storage:Keep in tightly closed containers at room temperatureAvoid prolonged exposure to light/heatHandling:Standard laboratory precautions (gloves, goggles)No special ventilation required

6. Applications

Insect Repellent: Effective against mosquitoes, ticks, and flies (EPA-registered)Cosmetics: Used in lotions, sprays (up to 20% concentration)Pharmaceuticals: Topical formulations

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