Semicarbazide

• N- aminourea
• Carbamidsäurehydrazid
• Carbamylhydrazin

• 57-56-7 ( semicarbazide )
• 563-41-7 (hydrochloride)

Colorless crystals

Fixed

96 ° C

• Readily soluble in ethanol and water
• Slightly soluble in diethyl ether and benzene

Hydrochloride

Risk

Template: Infobox chemical / molecular formula search available

Semicarbazide, N- aminourea, is a chemical compound and a derivative of urea. The firm, slightly water-soluble substance was formerly often used for the characterization of carbonyl compounds, because the reaction products ( semicarbazones ) crystallize well and usually have sharp melting points.

Preparation, properties and reactions

N- aminourea is represented by the reaction of potassium cyanate with hydrazine or hydrazine hydrate with urea

The colorless, crystalline compound is readily soluble in ethanol and water, slightly in ether or benzene. When heated, decomposes to form hydrazine, semicarbazide, and hydrazodicarbonamide. With mineral acids aminourea forms well crystallized salts; with aldehydes and ketones are formed with elimination of water crystalline semicarbazones. Semicarbazide is used mainly in the form of a stable hydrochloride.