英语词汇“ureide”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	ureide
释义	ureide u·re·ide U0146700 (yo͝or′ē-īd′)n. Any of various derivatives of urea. [ure(a) + -ide.] ureide (ˈjʊərɪˌaɪd) n1. (Elements & Compounds) any of a class of organic compounds derived from urea by replacing one or more of its hydrogen atoms by organic groups2. (Elements & Compounds) any of a class of derivatives of urea and carboxylic acids, in which one or more of the hydrogen atoms have been replaced by acyl groups: includes the cyclic ureides, such as alloxan u•re•ide (ˈyʊər iˌaɪd, -ɪd) n. an acyl urea. [1855–60] Ureide 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. ureide u·re·ide (yūr'ē-īd), Any compound of urea in which one or more of its hydrogen atoms have been substituted by acid radicals. ureide any compound formed between urea and organic acids.
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