Diethyl carbonate

Diethyl carbonate (sometimes abbreviated DEC) is an ester of carbonic acid and ethanol with the formula OC(OCH2CH3)2. At room temperature (25 °C) diethyl carbonate is a colorless liquid with a low flash point.

"Ethyl carbonate" redirects here. For the monoethyl carbonate group, see Etabonate.
Diethyl carbonate
Names
Preferred IUPAC name
Diethyl carbonate
Other names
Carbonic ether; Ethyl carbonate, di-; Eufin[1]
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.003.011
EC Number
  • 203-311-1
RTECS number
  • FF9800000
UNII
UN number 2366
  • InChI=1S/C5H10O3/c1-3-7-5(6)8-4-2/h3-4H2,1-2H3 checkY
    Key: OIFBSDVPJOWBCH-UHFFFAOYSA-N checkY
  • O=C(OCC)OCC
Properties
C5H10O3
Molar mass 118.132 g·mol−1
Appearance Colorless liquid
Density 0.975 g/cm3
Melting point −43 °C (−45 °F; 230 K) [2]
Boiling point 125.9 °C (258.6 °F; 399.0 K) [2]
Insoluble
Hazards
GHS labelling:
GHS02: FlammableGHS07: Exclamation mark
Warning
H226, H315, H319, H335
P210, P233, P240, P241, P242, P243, P261, P264, P271, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, P403+P235, P405, P501
Flash point 33 °C (91 °F; 306 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references

Diethyl carbonate is used as a solvent such as in erythromycin intramuscular injections.[3][4][5] It can be used as a component of electrolytes in lithium batteries. It has been proposed as a fuel additive to support cleaner diesel fuel combustion because its high boiling point might reduce blended fuels' volatility, minimizing vapor buildup in warm weather that can block fuel lines.[6] As a fuel additive, it can reduce emissions such as volatile organic compounds, CO2, and particulates.[7]

Production

It can be made by reacting phosgene with ethanol, producing hydrogen chloride as a byproduct. Because chloroform can react with oxygen to form phosgene, chloroform can be stabilized for storage by adding 1 part (by mass) of ethanol to 100 parts (by mass) of chloroform, so that any phosgene that forms is converted into diethyl carbonate.

2 CH3CH2OH + COCl2 → CO3(CH2CH3)2 + 2HCl

It can also be made by the alcoholysis of urea with ethanol. This reaction requires a heterogeneous catalysis that can act both as a Lewis acid and a base, such as various metal oxides. The reaction proceeds via the formation of the intermediary ethyl carbamate.[7]

2 CH3CH2OH + CO(NH2)2 → CO3(CH2CH3)2 + 2 NH3

It can also be synthesized directly from carbon dioxide and ethanol using various methods, and via oxidative carbonylation with carbon monoxide. Another method is transesterification from dimethyl carbonate. Yet another method is from the reaction of ethyl nitrite and carbon monoxide, where the ethyl nitrite can be made from nitric oxide and ethanol. This method requires a catalyst such as palladium.[7]

Use in biological research

0.01% v/v DEC solutions can be used as a relatively gentle cold sterilizing reagent for laboratory chromatography resins.[8]

See also

References
  1. "DIETHYL CARBONATE". Retrieved 2010-02-01.
  2. William M. Haynes, ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. p. 15-15. ISBN 978-1498754293.
  3. Anderson, Robert C.; Harris, Paul N.; Chen, K. K. (1955). "Further toxicological studies with ilotycin® (Erythromycin, Lilly)". Journal of the American Pharmaceutical Association. 44 (4): 199–204. doi:10.1002/jps.3030440404. ISSN 1930-2304. PMID 14367139.
  4. US 4382086, Sciavolino, Frank C. & Hauske, James R., "9-Dihydro-11,12-ketal derivatives of erythromycin A and epi-erythromycin A", published 1983-05-03, issued 1982-03-01, assigned to Pfizer Inc.
  5. US 4363803, Hauske, James R., "3",4"-Oxyallylene erythromycin and oleandomycin, composition and method of use", published 1982-12-14, issued 1982-03-01, assigned to Pfizer Inc.
  6. Walter, K. Scientists Discover Method for Cleaner Fossil Fuel. MR&D Magazine. 09/18/2017 - 3:16pm
  7. Shukla, Kartikeya; Srivastava, Vimal Chandra (2016). "Diethyl carbonate: critical review of synthesis routes, catalysts used and engineering aspects". RSC Advances. 6 (39): 32624–32645. Bibcode:2016RSCAd...632624S. doi:10.1039/c6ra02518h. Retrieved Aug 3, 2021.
  8. Rad, Bio-. "Bio-Gel A Gels - Instruction Manual" (PDF). Retrieved 12 April 2023.
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