Summary
Oxamide is the organic compound with the formula (CONH2)2. This white crystalline solid is soluble in ethanol, slightly soluble in water and insoluble in diethyl ether. Oxamide is the diamide derived from oxalic acid, and the hydrate of cyanogen.
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| Names | |||
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| Preferred IUPAC name
Oxamide[1] | |||
| Systematic IUPAC name
Ethanediamide | |||
Other names
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3D model (JSmol)
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| ECHA InfoCard | 100.006.767 | ||
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |||
| (CONH2)2 | |||
| Molar mass | 88.0654 g/mol | ||
| Appearance | White powder | ||
| Density | 1.667 g/cm3 | ||
| Melting point | 122 °C (252 °F; 395 K) [3] | ||
| Boiling point | 324 °C (615 °F; 597 K) ,[2] decomposes above 350 °C | ||
| Slightly soluble | |||
| Solubility | Soluble in ethanol, insoluble in diethyl ether | ||
| −39.0·10−6 cm3/mol | |||
| Hazards | |||
| Flash point | > 300 °C (572 °F; 573 K) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Preparation edit
Oxamide is produced from hydrogen cyanide, which is oxidized to cyanogen, which is then hydrolyzed.[5]
It can also be prepared from formamide by glow-discharge electrolysis.[6]
Application edit
The main application is as a substitute for urea in fertilizers. Oxamide hydrolyzes (releases ammonia) very slowly, which is sometimes preferred vs the quick release by urea.
It is used as a stabilizer for nitrocellulose preparations. It also finds use in APCP rocket motors as a high performance burn rate suppressant. The use of oxamide in concentrations of 1-3 wt% has shown to slow the linear burn rate while having minimal impact on propellant specific impulse.
N,N'-substituted oxamides are supporting ligands for the copper-catalyzed amination and amidation of aryl halides in (Ullmann-Goldberg reaction), including relatively unreactive aryl chloride substrates.[7]
Reactions edit
It dehydrates above 350 °C releasing cyanogen. Oxamide derivatives form self-assembled monolayers consisting of a hydrogen bonded network.[8]
References edit
- ^ Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 841. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
- ^ "Oxamide | C2H4N2O2 | ChemSpider".
- ^ "Oxamide | C2H4N2O2 | ChemSpider".
- ^ GHS: Sigma-Aldrich 75770[dead link]
- ^ Riemenschneider, Wilhelm; Tanifuji, Minoru (2002). "Oxalic Acid". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a18_247. ISBN 978-3527306732..
- ^ Brown, E. H.; Wilhide, W. D.; Elmore, K. L. (1962). "A New Method for the Preparation of Oxamide". The Journal of Organic Chemistry. 27 (10): 3698. doi:10.1021/jo01057a516.
- ^ Zhou, Wei; Fan, Mengyang; Yin, Junli; Jiang, Yongwen; Ma, Dawei (2015-09-23). "CuI/Oxalic Diamide Catalyzed Coupling Reaction of (Hetero)Aryl Chlorides and Amines". Journal of the American Chemical Society. 137 (37): 11942–11945. doi:10.1021/jacs.5b08411. ISSN 0002-7863. PMID 26352639.
- ^ Nguyen T.L., Fowler F.W., Lauher J.W., "Commensurate and incommensurate hydrogen bonds. An exercise in crystal engineering." Journal of the American Chemical Society, 123(44), pp. 11057-64, 2001. doi:10.1021/ja016635v