Chemistry:Semicarbazide

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Semicarbazide
Skeletal formula of semicarbazide
Ball-and-stick model of the semicarbazide molecule
Names
IUPAC name
Aminourea[1]
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
KEGG
UNII
Properties
H2NNHC(=O)NH2
Molar mass 75.08 g/mol
Melting point 96 °C
Hazards
Safety data sheet [1]
GHS pictograms GHS06: ToxicGHS07: Harmful
GHS Signal word Danger
H301, H315, H319, H335
P261, P264, P270, P271, P280, P301+310, P302+352, P304+340, P305+351+338, P312, P330, P332+313, P337+313, P362, P403+233, P405
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
2
0
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
Tracking categories (test):

Semicarbazide is the chemical compound with the formula OC(NH2)(N2H3). It is a water-soluble white solid. It is a derivative of urea.

Synthesis

The compound prepared by treating urea with hydrazine:[2]

OC(NH2)2 + N2H4 → OC(NH2)(N2H3) + NH3

A further reaction can occur to give carbohydrazide:

OC(NH2)(N2H3) + N2H4 → OC(N2H3)2 + NH3

Derivatives

Semicarbazide is frequently reacted with aldehydes and ketones to produce semicarbazones via a condensation reaction. This is an example of imine formation resulting from the reaction of a primary amine with a carbonyl group. The reaction is useful because semicarbazones, like oximes and 2,4-DNPs, typically have high melting points and crystallize, facilitating purification or identification of reaction products.[3]

Properties

Semicarbazide products (semicarbazones and thiosemicarbazones) are known to have an activity of antiviral, antiinfective and antineoplastic through binding to copper or iron in cells.

Uses, occurrence, detection

Semicarbazide is used in preparing pharmaceuticals including nitrofuran antibacterials (furazolidone, nitrofurazone, nitrofurantoin) and related compounds. It is also a product of degradations of the blowing agent azodicarbonamide (ADC). Semicarbazide forms in heat-treated flour containing ADC as well as breads made from ADC-treated flour.[4][5]

Semicarbazide is used as a detection reagent in thin layer chromatography (TLC). Semicarbazide stains α-keto acids on the TLC plate, which can then be viewed under ultraviolet light.

See also

References

  1. ↑ CID 5196 from PubChem
  2. ↑ Jean-Pierre Schirmann, Paul Bourdauducq "Hydrazine" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2002. doi:10.1002/14356007.a13_177.
  3. ↑ John McMurry (1984). Organic Chemistry. Brooks/Cole. p. 676. 
  4. ↑ Becalski, Adam; Lau, Benjamin; Lewis, David; Seaman, Stephen (2004). "Semicarbazide Formation in Azodicarbonamide-Treated Flour: A Model Study". J. Agric. Food Chem. 52 (18): 5730–4. doi:10.1021/jf0495385. PMID 15373416. 
  5. ↑ Maria Beatriz de la Calle; Elke Anklam (2005). "Semicarbazide: occurrence in food products and state-of-the-art in analytical methods used for its determination". Anal. Bioanal. Chem. 382 (4): 968–977. doi:10.1007/s00216-005-3243-z. PMID 15947918. 

External links

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See also
Receptor/signaling modulators
GABAA receptor positive modulators
GABA metabolism/transport modulators

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