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Encyclopedia Britannica



C5H4N4O3

This article appears in Volume V01, Page 688 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BUN-CAL
C5H4N4O3 + H2O + 0 s C4H6N4O3 + CO2.
It has been synthesized by E. Grimaux by
heating
  one
part
  of glyoxylic acid with two parts of urea for ten
hours
  at too C.: 2CO(NH2)2+ CH(OH)2COOH= 3H20 + C4H6N4O3. It forms glancing prisms of neutral reaction slightly soluble in water. On
standing
  with concentrated potassium hydroxide solution it gives potassium allantoate C4H7N4O4K. On
heating
  with water it undergoes
hydrolysis
  into urea and allanturic acid CsH4O3N2. It is reduced by sodium
amalgam
  to glycouril C4H6N4O2, whilst with hydriodic acid it yields urea and hydantoin C3H4N2O2. Hot concentrated sulphuric acid also decomposes
allantoin
 , with production of
ammonia
 , and carbon monoxide and dioxide. By dry
distillation
  it gives ammonium
cyanide
 .


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