1H- imidazo[4,5- d ]pyrimidine . C5H4N4 (120.11). Purine itself does not occur in nature, but various derivatives do. In plants, caffeine (tea, coffee), theobromine (cocoa), theophylline (tea), xanthine ( seeds, leaves, fruits), etc. In animals, xanthine (urine, blood, liver), adenine, guanine (nucleic acids), uric acid (urine), etc. It is obtained by heating 4,5-diaminopyrimidine with formic acid in the presence of carbon dioxide, or by treating uric acid with phosphorus trichloride to make the trichloro derivative, which is then reduced with hydrogen iodide. Colorless needles. Melting point 216-217 °C. Easily soluble in water and hot ethanol, slightly soluble in hot ethyl acetate and acetone, insoluble in ether and chloroform. Adenine and guanine are important as bases in nucleic acids, and uric acid and xanthine are closely related to purine metabolism in the body. Many purine derivatives are thus important in biochemistry. [CAS 120-73-0] Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
1H-imidazo[4,5-d]pyrimidine.C5H4N4(120.11).プリンそのものは天然に存在しないが,各種の誘導体が天然に存在している.植物においては,カフェイン(茶,コーヒー),テオブロミン(カカオ),テオフィリン(茶),キサンチン(種子,葉,果実)など.動物においては,キサンチン(尿,血液,肝臓),アデニン,グアニン(核酸),尿酸(尿)などがある.4,5-ジアミノピリミジンを二酸化炭素の存在下でギ酸とともに加熱するか,尿酸を三塩化リンで処理し,トリクロロ誘導体にして,ヨウ化水素で還元すると得られる.無色の針状晶.融点216~217 ℃.水,熱エタノールに易溶,熱酢酸エチル,アセトンに微溶,エーテル,クロロホルムに不溶.アデニン,グアニンは核酸中の塩基として重要であり,尿酸,キサンチンは生体のプリン代謝に関係が深い.プリン誘導体はこのように生化学上重要なものが多い.[CAS 120-73-0] 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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