Overview
Ethyl acetoacetate (EAA) is an important ester of acetoacetic acid, serving as a versatile building block in organic synthesis. First prepared in 1863, it's now produced industrially via Claisen condensation of ethyl acetate. As a β-ketoester compound, EAA exhibits unique keto-enol tautomerism that enables diverse chemical reactions. Its dual functional groups (ketone and ester) make it valuable for producing heterocyclic compounds, pharmaceuticals, and specialty chemicals.
Physical and Chemical Properties
EAA appears as a mobile liquid with a characteristic fruity odor. It shows 92% keto form and 8% enol form at room temperature, with the equilibrium affected by solvents and temperature. The compound's reactivity includes typical ester reactions (hydrolysis, transesterification) and ketone reactions (condensations, reductions). It forms stable enolates with bases, enabling alkylation and acylation reactions. EAA can chelate metal ions, making it useful in coordination chemistry.
Main Applications
In pharmaceuticals, EAA synthesizes antimalarials (chloroquine), antibiotics (penicillins), and vitamin B1. It's crucial for producing pyrrole and pyridine derivatives. The agrochemical industry uses EAA to manufacture insecticides (pyrethroids) and herbicides. In fragrances, it contributes fruity notes. Other uses include dyes, resins, and as a solvent for cellulose esters. Recent research explores its role in battery electrolytes and polymer synthesis.
Safety and Storage
EAA is classified as flammable (Flash point: 84°C) and moderately toxic. Proper storage requires steel or polyethylene containers in areas with explosion-proof equipment. Handling requires chemical-resistant gloves, goggles, and vapor respirators. Spills should be contained with inert absorbents. Waste disposal must follow local regulations for organic esters. Shelf life is typically 2 years when properly stored under nitrogen atmosphere.
B2B Procurement Guide
Industrial buyers should specify technical grade (≥98%) or pharmaceutical grade (≥99.5%). Key quality indicators include acid value (<0.1%) and water content (<0.1%). Major production regions include China, India, and Western Europe. For bulk orders (>1MT), tanker shipments reduce packaging costs. Consider suppliers with ISO 9001 certification and REACH compliance. Sample testing is recommended to verify color and purity specifications.
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