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A12771 Diethyl ketomalonate, 95%

CAS Number
Diethyl mesoxalate
Diethyl oxomalonate

Stock No. Size Price ($) Quantity Availability
A12771-06 5g 39.70
A12771-14 25g 134.00
A12771-22 100g 467.00
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Diethyl ketomalonate, 95%


Chemical Properties

Formula Weight
Melting point
ca -70°
Boiling Point
Flash Point
Refractive Index
Storage & Sensitivity
Moisture Sensitive. Store under Nitrogen. Ambient temperatures.
Fully miscible with water.


Diethyl ketomalonate, reagent employed in Wittig and Aza-Wittig reactions for synthesis of triazoles, and 2-azadienes, respectively.


Moisture Sensitive. Store in cool dry place in tightly closed container. With good ventilation. Store away from oxidizing agent and water/moisture.

Literature References

D. Basavaiah; V. V. L. Gownswari. Diethyl Ketomalonate: A Fast Reacting Substrate for Baylis-Hillman Reaction. Synthetic Communications: An International Journal for Rapid Communication of Synthetic Organic Chemistry. 1989,(13-14), 6898-6904.

M. Sugawara; M.M. Baizer. Electrogenerated bases VII. Novel syntheses of ethyl glyoxalate and diethyl ketomalonate via electrogenerated superoxide. Tetrahedron Letters. 1983,24(22), 2223-2226.

The carbonyl group behaves as a heterodienophile towards simple dienes. Curtius degradation of the gem-diester to carbonyl completes a synthesis of ß-unsaturated δ-lactones: Rocz. Chem., 38, 707 (1964); J. Am. Chem. Soc., 97, 6892 (1975); J. Org. Chem., 42, 4095 (1977):

For asymmetric Diels-Alder reaction, see: J. Chem. Soc., Chem. Commun., 676 (1987). For addition to aza-dienes, see: Tetrahedron Lett, 30, 2685 (1989).

Ene-addition to alkenes occurs at the less-substituted carbon. Oxidative degradation leads to ß-unsaturated carboxylic acids: J. Am. Chem. Soc., 102, 2473 (1980); 106, 3797 (1984):

Thus, the reagent could be regarded as a CO2 equivalent in both the above sequences.

Undergoes the Baylis-Hillman reaction in which a carbanionic species, generated by the reversible addition of 1,4-Diazabicyclo[2.2.2]octane, A14003, to a Michael acceptor, adds to the carbonyl group: Synth. Commun., 19, 2461 (1989).

Reacts with activated arenes under Friedel-Crafts conditions, or with aryllithium or Grignard derivatives, to give aryl hydroxymalonates, hydrolysis and decarboxylation of which gives substituted mandelic acids: Org. Synth. Coll., 3, 326 (1955). Alternatively, they may be transformed reductively to arylmalonates and hence to ester enolates: J. Org. Chem., 47, 4692 (1982).

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P264b-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P332+P313-P337+P313-P362-P501c

Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. If skin irritation occurs: Get medical advice/attention. If eye irritation persists: Take off contaminated clothing and wash before reuse. Dispose of contents/ container to an approved waste disposal plant

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