Sentence Examples


  • By using urea, guanidine, thiourea and related compounds instead of amidines, one obtains the uracils.
  • The dihydro derivatives are most probably those compounds which are formed in the condensation of acidyl derivatives of acetone, with urea, guanidine, &c. Tetrahydropyrimidines are obtained by the action of amidines on trimethylene bromide: Br(CH 2) 3 Br+C 6 H 5 C (:NH) NH 2 = 2HBr+C 4 H 7 N 2 (C 6 H 5) [2].
  • Uracil and its homologues may be obtained in many cases from the hydrouracils by the action of bromine, and subsequent elimination of the elements of hydrobromic acid; or by the condensation of aceto-acetic ester and related substances with urea, thiourea, guanidine, &c. Uracil, C4H402N2, crystallizes in colourless needles, is soluble in hot water and melts with decomposition at 335° C. Hydrouracil, C4H602N2, is obtained by the action of bromine and caustic alkalis on succinamide (H.
  • CH(NH 2) � Cooh, arginin or guanidine-a-amino-n-valerianic acid, (NH)(NH2)C�NH� (CH 2) 3 �CH(NH 2)�Cooh, ornithin or aa-diamino valerianic acid, � (CH 2) 3 � CH(NH 2) � Coon, -(3-imidazol propionic acid, [[Hooc� Ch(Nh 2) �Ch 2 � C: Ch�N:Ch�Nh]], proline or a-pyrrolidin carboxylic acid, [[Hooc� Ch.
  • When heated with ammonia it yields guanidine, and on boiling with alcoholic potash it yields potassium carbonate.

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