| 单词 |
pyrazine |
| 释义 |
pyrazine Chem.|ˈpaɪər-, ˈpɪrəzɪn|
[ad. G. pyrazin (A. T. Mason 1887, at suggestion of V. Merz, in Ber. d. Deut. Chem. Ges. XX. 267). f. pyridin pyridine with inserted az- (see azo-).]
A weakly basic white crystalline solid, CH:N·CH:CH·N:CH ; any substituted derivative of this.
[1887Jrnl. Chem. Soc. LII. i. 493 Xenylenedihydropyrazine.] 1888Proc. Chem. Soc. IV. 107 The author [sc. Mason] adopts Widman's nomenclature..: the ‘Ketines’.., ‘Pyrazines’.., ‘Aldines’.., and all compounds containing a ring of four carbon-atoms and two nitrogen-atoms in para-position are now termed Paradiazines, or Piazines. 1926H. G. Rule tr. J. Schmidt's Text-bk. Org. Chem. iii. viii. 699 Pyrazine itself is produced by the condensation of amino-acetaldehyde or amino-acetal. It..has an odour of heliotrope. 1967M. H. Palmer Struct. & Reactions Heterocyclic Compounds iii. 89 Pyrazines are readily prepared by the self-condensation of α-aminoketones. 1970Acta Crystallographica B. XXVI. 979/1 Pyrazine..and Cu(NO3)2 form an anhydrous crystalline complex with a 1:1 pyrazine to Cu(NO3)2 ratio. |
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。
相关内容：
相关热词搜索：pyrazine英英词典英英释义英语词汇意思用法释义英语
字词 居功 释义 take credit to oneself 汉译英翻译词典收录405719条汉英翻译词条，基本涵盖了......