Diethyl ketomalonate
Diethyl ketomalonate (CAS 609-09-6) is an organic compound with the formula CO(CO2C2H5)2 and a molar mass of 174.15 g/mol. This ester serves as a valuable reagent in organic synthesis, particularly in Wittig and Aza-Wittig reactions. Its chemical structure lends itself to the formation of complex heterocyclic compounds and dienes, making it a useful building block for advanced chemical research and development.
- IUPAC
- Diethyl mesoxalate,Ketomalonic acid diethyl ester

Wittig and Aza-Wittig Reactions
Diethyl ketomalonate is employed as a key reagent in Wittig and Aza-Wittig reactions. These reactions are instrumental in the synthesis of specific organic molecules, including triazoles and 2-azadienes.
Heterocyclic Compound Synthesis
This compound is a versatile building block for constructing various heterocyclic systems. Its reactive carbonyl and ester functionalities allow for diverse synthetic transformations.
Organic Synthesis Intermediate
As an ester and a diketone derivative, Diethyl ketomalonate is widely used as an intermediate in multi-step organic syntheses, contributing to the creation of more complex molecular architectures.
| Molecular weight | 174.15 |
|---|---|
| Linear formula | CO(CO2C2H5)2 |
| Assay | 95% |
| Boiling point | 208-210 °C(lit.) |
| Density | 1.142 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.415(lit.) |
| Application | Reagent employed in Wittig and Aza-Wittig reactions for synthesis of triazoles1 and 2-azadienes,2 respectively. |
| Protective equipment | Eyeshields, Gloves, half-mask respirator (EU), half-mask respirator (US), multi-purpose combination respirator cartridge (US) |
|---|---|
| Flash point | 113 °C / 235.4 °F |
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Diethyl ketomalonate used for?
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Diethyl ketomalonate is primarily used as a reagent in Wittig and Aza-Wittig reactions for the synthesis of triazoles and 2-azadienes, respectively. It also functions as a versatile building block in general organic synthesis.
What are the CAS number and formula for Diethyl ketomalonate?
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The CAS number for Diethyl ketomalonate is 609-09-6, and its linear formula is CO(CO2C2H5)2.
What grade and purity does Tech Serve Solutions supply for Diethyl ketomalonate?
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Tech Serve Solutions supplies Diethyl ketomalonate with an assay of 95%. We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade unless explicitly stated in the product specifications.
How should Diethyl ketomalonate be handled safely?
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Diethyl ketomalonate should be handled with appropriate personal protective equipment, including eyeshields and gloves. Use of a half-mask respirator is recommended in accordance with local safety guidelines. It is combustible, with a flash point of 113 °C (235.4 °F).
Does Tech Serve Solutions export Diethyl ketomalonate?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including Diethyl ketomalonate, serving customers worldwide.
How can I request a sample or quote for Diethyl ketomalonate?
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To request a sample or a quote for Diethyl ketomalonate, please contact our sales department through the website or by phone, providing the product name and CAS number.
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