|
|Section1= |Section2= |Section3= |Section4= |Section5= }} Biuret is a chemical compound with the chemical formula C2H5N3O2. It is also known as carbamylurea. It is the result of condensation of two molecules of urea and is a problematic impurity in urea-based fertilizers. This white solid is soluble in hot water. Biuret was first prepared and studied by Gustav Heinrich Wiedemann (1826 - 1899) for his doctoral dissertation, which was submitted in 1847. His findings were reported in several articles.〔 This notice reports that biuret reacts with alkaline copper sulfate to produce a red solution -- the so-called "Biuret test" 〕 The term "biuret" also describes a family of organic compounds with the functional group -(HN-CO-)2N-. Thus dimethyl biuret is CH3HN-CO-NR'-CO-NHCH3. A variety of organic derivatives are possible. ==Preparation== The parent compound can be prepared by heating urea above the melting point at which temperature ammonia is expelled: : 2 CO(NH2)2 → H2N-CO-NH-CO-NH2 + NH3 Under related conditions, pyrolysis of urea affords triuret ((H2N-CO-NH)2CO).〔 In general, organic biurets (those with alkyl or aryl groups in place of one or more H atoms) are prepared by trimerization of isocyanates. For example the trimer of 1,6-hexamethylene diisocyanate is also known as HDI-biuret. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Biuret」の詳細全文を読む スポンサード リンク
|