Ureide
| Ureide (examples) |
|---|
 N -acetylurea (acetic acid derivative) |
 Barbituric acid (malonic acid derivative) |
 Parabanic acid (oxalic acid derivative) |
Urea are organochemical substances derived from urea (H 2 N – CO-NH 2 ) and carboxylic acids (R – COOH). The ureide of acetic acid is acetylurea (H 3 C – CO – HN – CO-NH 2 ).
The cyclic ureals, which are derived from aliphatic dicarboxylic acids ( oxalic acid , malonic acid, etc.) are of particular importance .
According to IUPAC rule C-971.2, such compounds are to be referred to as N- acylureas or ureido derivatives.
Manufacturing
Urea is synthetically accessible through the action of carboxylic acid chlorides or carboxylic acid anhydrides on urea. Barbituric acid - the cyclic ureide of malonic acid is made from urea and a diester of malonic acid in the presence of sodium ethanolate.
Web links
Commons : Acylureas - collection of images, videos and audio files
Individual evidence
- ^ Brockhaus ABC Chemie , VEB FA Brockhaus Verlag, Leipzig 1965, p. 1465.
- ^ Otto-Albrecht Neumüller (editor): Römpps Chemie Lexikon , 8th edition, Frank'sche Verlagshandlung, Stuttgart 1983, ISBN 3-440-04513-7 , pp. 4444-4445.
- ^ Siegfried Hauptmann : Organic Chemistry , 2nd revised edition, VEB Deutscher Verlag für Grundstoffindindustrie, Leipzig 1985, ISBN 3-342-00280-8 , p. 468.