Oxamide

Synonym(s):Oxalic acid diamide

CAS NO.：471-46-5
Empirical Formula: C2H4N2O2
Molecular Weight: 88.07
MDL number: MFCD00008007
EINECS: 207-442-5
SAFETY DATA SHEET (SDS)
Update Date: 2024-08-17 21:30:02

What is Oxamide?

Description

Oxamide, the diamide of oxalic acid, is an extremely stable white crystalline solid. It can be heated to >300 °C before decomposing. It is produced by the oxidation of HCN to (CN)2, followed by hydrolysis. Its chief uses are as a nitrogen fertilizer and as a stabilizer for nitrocellulose products. P. J. Chirik and D. J. Knobloch recently used an elegant hafnium complex to?convert N2?and CO to oxamide.

Chemical properties

white fine crystalline powder

Chemical properties

Oxamide, H2NCOCONH2, mol wt 80.07, is sparingly soluble in water and insoluble in various organic solvents. It melts at about 350 °C, with accompanying decomposition. Because of the low solubility in water, the compound is granulated and used as a slow-release nitrogen fertilizer.

The Uses of Oxamide

Oxamide is used as a stabilizer for nitrocellulose preparations. It also finds use in APCP rocket motors as a high performance burn rate suppressant.

Definition

ChEBI: A dicarboxylic acid diamide of oxalic acid.

Preparation

Oxamide can be prepared, for example, by pyrolyzing ammonium oxalate or by allowing hydrogen cyanide to react with hydrogen peroxide. It is also known to prepare oxamide by a reaction between dimethyl oxalate and ammonia, wherein methanol is produced in addition to oxamide. The preparation was carried out as a batch process in a liquid phase, with methanol acting as a solvent into which the dimethyl oxalate and ammonia are fed. The oxamide was separated from the solution by crystallization, and the remaining mother liquor was distilled to recover methanol and ammonia, which had been left over from the reaction.

Agricultural Uses

Oxamide (H₂ NCOCONH₂ ), a diamide of oxalic acid, is a white crystalline and non-hygroscopic fertilizer containing about 32% nitrogen, most of which is waterinsoluble at 25°C. Oxamide is made from cyanogen hydrolysis in an acid medium. It releases nitrogen slowly and hence is used as a slow-release fertilizer. It is decomposed by soil micro-organisms in the soil.

Safety Profile

Poison by ingestion and intraperitoneal routes. An eye irritant. When heated to decomposition it emits toxic fumes of NOx. See also AMIDES.

Purification Methods

Crystallise oxamide from water, grind it and dry it in an oven at 150o. [Beilstein 2 IV 1860.]

Properties of Oxamide

Melting point:	>300 °C (lit.)
Boiling point:	162.99°C (rough estimate)
Density	1,667 g/cm³
refractive index	1.4264 (estimate)
storage temp.	Sealed in dry,Room Temperature
solubility	0.37g/l
pka	13.28±0.50(Predicted)
form	Fine Crystalline Powder
color	White
Water Solubility	insoluble
Merck	14,6918
BRN	1743262
CAS DataBase Reference	471-46-5(CAS DataBase Reference)
NIST Chemistry Reference	Oxalamide(471-46-5)
EPA Substance Registry System	Ethanediamide (471-46-5)

Safety information for Oxamide

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P270:Do not eat, drink or smoke when using this product. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.