Ureide

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Ureide

(also known as ureid), any of the derivatives of urea [CO(NH₂)₂] resulting from the substitution of acyl (RCO) radicals for hydrogen atoms in the NH₂ groups. Ureides are crystalline, high-melting compounds; the melting point of acetylurea (CH₃CONHCONH₂) is 218°C, while that of diacetylurea (CH₃CONH)₂CO is 153°C. Cyclic ureides are obtained from the reaction of urea with dibasic acids; for example, barbituric acid is obtained by reacting urea with malonic acid or malonic ester. The ureides of brome-substituted acids (bromisoval, carbromal) and cyclic ureides of the barbiturate type are used as sedatives.

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No references found			Urdu Urdu language Urdu Literature Ure, Andrew Urea urea anhydride urea dewaxing urea nitrate urea peroxide urea resin urea resin adhesive urea-formaldehyde urea-formaldehyde resin Urea-Formaldehyde Resins Urease Ureche Ureche Glass Urechinidae Uredinales Uredinalis Urediniomycetes urediniospore uredinium Urediospore uredospore Ureide ureilite Ureke, Evgenii Ureke, Evgenii Vasilevich Ureke, Grigore Ureki Urema Uremia Uren Urenga ureotelic Ureter Urethane Urethane Elastomers Urethra urethral gland Urethritis Urethroscopy Urey Urey, Harold Urey, Harold C Urey, Harold Clayton ureyite Urfa Urfé, Honoré d' Urfe, Honored			Ured za Nacionalnu Sigurnost UREDA uredema uredia uredia Uredinales Uredinales Uredinalis uredinia uredinia Urediniomycetes urediniospore urediniospore uredinium uredinium uredinology urediospore uredium uredium Uredo uredofos uredosorus uredospore uredospore uredostage UREF UREG UREI ureid ureid Ureide ureides ureides ureidopenicillins ureids ureids ureilite Ureka Ureka Ureka Ureke, Evgenii Ureke, Evgenii Vasilevich Ureke, Grigore Ureki urelcosis Urema uremia uremia uremia uremic uremic uremic uremic acidosis uremic acidosis uremic acidosis uremic arteritis uremic arteritis uremic arteritis uremic bone disease uremic bone disease uremic bone disease

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Ureide