What is Ethyl Acetoacetate Definition Formula Preparation Reactions and Uses
Ethyl acetoacetate is an organic compound that is the ethyl ester of acetoacetate. The chemical formula of this compound is C6H10O3 or CH3COOCH2COOC2H5. This compound is present as a colourless liquid with a fruity fragrance that is used as a food flavouring. It is also used as a chemical intermediate for the production of various types of chemical compounds. This compound is also used industrially in the production of synthetic dyes and drugs.
Ethyl acetoacetate is industry produced compound. The ethyl acetoacetate structure is produced using the treatment of ethanol with diketene. The production of this compound in the laboratory is a very well-known procedure. This is done by using the process of Claisen condensation of ethyl acetate.
The reaction produces one molecule of ethyl acetoacetate and one molecule of ethanol from the condensation of two molecules of ethyl acetate.
CH3COOCH2COOC2H5 is a primary part of acetoacetate ester synthesis. Now that you have a brief understanding of this compound and its production. Let’s now learn about acetoacetate ester synthesis.
What is Acetoacetate Ester Synthesis?
Ester synthesis of acetoacetate is a chemical reaction where α-substituted acetone and a ketone are produced by the alkylation of ethyl acetoacetate at the α-carbon to the two types of carbonyl groups.
This chemical reaction uses a strong base that helps deprotonate the dicarbonyl α-carbon. Due to resonance stabilization and enolate conjugation, the dicarbonyl α-carbon is selected over the methyl carbon. The process of preference of one carbon over the other is known as a nucleophilic substitution in this reaction.
When the ester is heated with aqueous acids, it creates a new hydrolyzed β-keto acid from the alkylated ester. The β-keto acid can then be decarboxylated to form methyl ketone.
That is a brief understanding of ester synthesis, which talked about how the synthesis is completed. Each of these compounds is created by their internal molecular and chemical structure; the ethyl acetoacetate structure or the ethyl acetoacetate formula is C6H10O3 or CH3COOCH2COOC2H5. The chemical and molecular acetoacetate structure is C4H5O3-. The acetoacetate structure is derived from the ester synthesis of compounds such as ethyl acetoacetate.
Some Facts About Ethyl Acetoacetate to Better Understand the Compound
These are some of the important facts about the compound that will help you understand how it works with other compounds and its physical and chemical properties.
Ethyl Acetoacetate Reactions: This compound primarily reacts or is more easily introduced in condensation reactions. Reactions that use Claisen condensation widely use this compound as it is a classic laboratory experiment. This compound is generally used for synthesizing furans, pyrroles, pyridines, pyrazoles, purines, and quinolines.
Ethyl Acetoacetate Density: The ethyl acetoacetate density is 1.02 g/cm3. This means the ethyl acetoacetate density is 1.02 grams per cubic centimeter; in comparison, the density of fresh water is 1 gram per cubic centimeter at four degrees centigrade.
Ethyl Acetoacetate MSDS: MSDS stands for Material Safety Data Sheet. The ethyl acetoacetate MSDS states that this compound is combustible in both liquid and vapour forms with a flashpoint (the lowest temperature at which a combustible material can ignite if provided a source for ignition) of 70 degrees centigrade. This compound is also harmful to the respiratory organs of human beings along with their eyes and skin. Acetoacetate causes skin and eye irritation upon exposure. If this compound is ingested, it can cause gastrointestinal problems with vomiting and diarrhoea. In case of inhalation, this compound can lead to respiratory tract irritation with immediate effects such as drowsiness and dizziness. Repeated and prolonged exposure to this compound can lead to the skin being affected by dermatitis.
If you are exposed to ethyl acetoacetate, these are the safety precautions you will need to follow. In case you are caused eye irritation by exposure to this compound, you need to wash your eyes with cold running water for 15 minutes minimum to get rid of the irritation. If the irritation persists, you need medical assistance.
If exposure to this compound causes skin irritation, you need to clean the irritation area with cold water. Following that, removing all clothing items that you were wearing during the exposure to acetoacetate needs to be done. Medical aid is necessary if the skin irritation persists or increases.
In case of ingestion of ethyl acetoacetate, do not induce vomiting and get medical help as quickly as possible.
If you are exposed to this compound through inhalation, you need immediate medical help, but first, safely removing yourself or others from the area of exposure is needed. Oxygen supply might be needed if the person is not able to breathe or is having trouble breathing.
Ethyl Acetoacetate Molar Mass: The ethyl acetoacetate molecular weight is 130.14 g/mol; in comparison, the molar mass of acetoacetic acid is 102.88 g/mol.
Ethyl Acetoacetate Boiling Point: The boiling point of ethyl acetoacetate is 180.8OC. The melting point of this compound is -450C.
Ethyl Acetoacetate IUPAC Name: The IUPAC name of ethyl acetoacetate is ethyl 3-oxobutanoate.
Solved Examples
Q1: What is the Fragrance of Ethyl Acetoacetate?
A) Fruity
B) Pungent
C) Rotten
D) Sweet
Answer: A) Fruity
Q2: What is the IUPAC Name of Ethyl Acetoacetate?
A) 3Ethyl Acetoacetate
B) 4-Oxobutane ethyl
C) ethyl 3-oxobutanoate
D) Butaneoxyethanoate
Answer: C) ethyl 3-oxobutanoate
FAQs on Ethyl Acetoacetate Structure Properties and Chemical Reactions
1. What is ethyl acetoacetate?
Ethyl acetoacetate is a β-keto ester with the molecular formula C6H10O3. It contains both a ketone (>C=O) and an ester (–COOR) functional group in the same molecule. Structurally, it is written as CH3COCH2COOC2H5. Because of its active methylene group (–CH2– between two carbonyls), it is widely used in organic synthesis for forming substituted carboxylic acids and ketones.
2. What is the structure of ethyl acetoacetate?
The structure of ethyl acetoacetate is CH3–CO–CH2–COO–CH2CH3, showing both ketone and ester functional groups. Key structural features include:
- A ketone group (–CO–) at the second carbon.
- An ester group (–COO–) at the fourth carbon.
- An active methylene group (–CH2–) between the two carbonyl groups.
3. Why is ethyl acetoacetate called a β-keto ester?
Ethyl acetoacetate is called a β-keto ester because it has a ketone group at the β-position relative to the ester group. In its structure, the ketone carbonyl (C=O) is located two carbons away (β-position) from the ester carbonyl. Compounds with this 1,3-dicarbonyl arrangement are classified as β-keto esters and show enhanced stability of their enolate ions.
4. What is the molar mass of ethyl acetoacetate?
The molar mass of ethyl acetoacetate (C6H10O3) is 130.14 g/mol. It is calculated as:
- Carbon: 6 × 12.01 = 72.06 g/mol
- Hydrogen: 10 × 1.008 = 10.08 g/mol
- Oxygen: 3 × 16.00 = 48.00 g/mol
5. How is ethyl acetoacetate prepared?
Ethyl acetoacetate is prepared by the Claisen condensation of ethyl acetate in the presence of sodium ethoxide. The simplified balanced reaction is:
2CH3COOC2H5(l) + NaOC2H5(aq) → CH3COCH2COOC2H5(l) + C2H5OH(l) + NaOC2H5(aq)
- The base forms an enolate ion from ethyl acetate.
- The enolate attacks another ester molecule.
- After protonation, ethyl acetoacetate is formed.
6. Why is the methylene group in ethyl acetoacetate acidic?
The methylene group in ethyl acetoacetate is acidic because it is flanked by two electron-withdrawing carbonyl groups. The central –CH2– hydrogen atoms are easily removed by a base, forming a resonance-stabilized enolate ion. The negative charge is delocalized over both carbonyl oxygens, increasing stability and lowering the pKa compared to normal alkanes.
7. What is the acetoacetic ester synthesis?
The acetoacetic ester synthesis is a method for preparing substituted methyl ketones using ethyl acetoacetate. The general steps are:
- Formation of the enolate ion using a base (e.g., NaOC2H5).
- Alkylation with an alkyl halide (R–X).
- Acidic hydrolysis and heating.
CH3COCH2COOC2H5 → CH3COCH2R → CH3COCH2R (ketone) + CO2.
8. What happens when ethyl acetoacetate is hydrolyzed?
When ethyl acetoacetate is hydrolyzed under acidic conditions, it forms acetoacetic acid, which readily decarboxylates to acetone. The reactions are:
- Hydrolysis: CH3COCH2COOC2H5 + H2O → CH3COCH2COOH + C2H5OH
- Decarboxylation (on heating): CH3COCH2COOH → CH3COCH3 + CO2
9. What are the main uses of ethyl acetoacetate?
Ethyl acetoacetate is mainly used as a synthetic intermediate in organic chemistry. Its major uses include:
- Preparation of substituted ketones via acetoacetic ester synthesis.
- Synthesis of heterocyclic compounds like pyrazoles and pyrimidines.
- Manufacture of dyes, pharmaceuticals, and agrochemicals.
- Use as a starting material in fine chemical production.
10. What is the difference between ethyl acetoacetate and acetylacetone?
The main difference between ethyl acetoacetate and acetylacetone is that ethyl acetoacetate is a β-keto ester, while acetylacetone is a β-diketone. Key differences include:
- Ethyl acetoacetate: CH3COCH2COOC2H5 (one ketone + one ester group).
- Acetylacetone: CH3COCH2COCH3 (two ketone groups).
- Both contain active methylene groups, but acetylacetone shows stronger enol formation due to intramolecular hydrogen bonding.
