Ethyl acetoacetate

Ethyl acetoacetate 2D skeletal structure

Ethyl acetoacetate is an organic compound with the formula CH₃COCH₂COOC₂H₅. It is a colorless liquid that is used as a chemical intermediate in the production of a wide variety of compounds. It is the ethyl ester of acetoacetic acid.

Structure and properties

Ethyl acetoacetate 3D spacefill model

Ethyl acetoacetate is a beta-keto ester, which means it contains both a ketone and an ester functional group. The presence of these groups allows it to participate in a variety of chemical reactions, making it a versatile building block in organic synthesis. The compound is a colorless liquid with a fruity odor, and it is soluble in organic solvents but only slightly soluble in water.

Synthesis

Ethyl acetoacetate is commonly synthesized via the Claisen condensation of ethyl acetate. In this reaction, two molecules of ethyl acetate are combined in the presence of a strong base, such as sodium ethoxide, to form ethyl acetoacetate and ethanol.

Claisen condensation of ethyl acetate

Reactions

Ethyl acetoacetate is a versatile reagent in organic synthesis. It can undergo a variety of reactions, including:

• Keto-enol tautomerism: Ethyl acetoacetate exists in equilibrium between its keto and enol forms. This tautomerism is important for its reactivity in many chemical reactions.

• Alkylation: The enolate form of ethyl acetoacetate can be alkylated with alkyl halides to form substituted acetoacetates.

• Decarboxylation: Upon heating, ethyl acetoacetate can undergo decarboxylation to form acetone and carbon dioxide.

• Hydrolysis: Acidic or basic hydrolysis of ethyl acetoacetate yields acetoacetic acid, which can further decompose to acetone and carbon dioxide.

Applications

Ethyl acetoacetate is used in the synthesis of a wide range of compounds, including pharmaceuticals, dyes, and agrochemicals. It serves as a precursor to various heterocyclic compounds and is used in the production of vitamin B1 and vitamin A.

Safety

Ethyl acetoacetate is considered to be of low toxicity, but it should be handled with care. It can cause irritation to the skin and eyes, and inhalation of its vapors should be avoided.

Related pages

• Acetoacetic acid
• Claisen condensation
• Beta-keto ester