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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. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Faizah AW, Suratmini P, Nurhayata DP, Bagnall DJ, Bergersen FJ (1991) Re-evaluation of the, role of ureides in the xylem transport of nitrogen in Arachis-spp. |
ureides |
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 ureide ureides ureidopenicillinsureids 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 uremic bone disease uremic breath | |||||||
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