| 单词 | semidine |
| 释义 | semidine Chem.|ˈsɛmɪdiːn|
[ad. G. semidin (P. Jacobson 1893, in Ber. d. Deut. Chem. Ges. XXVI. 700), f. semi- semi- + benzi-din benzidine (s.v. benzo-).]
Any compound which is either (a) an ortho- anilino-derivative, or (b) an N-para-aminophenyl derivative, of a para-substituted aniline (distinguished as ortho- and para-semidines respectively); also semidine base; semidine reaction, semidine transformation, etc., the rearrangement of para-substituted hydrazobenzenes in the presence of acid to yield ortho- and para-semidines (in proportions governed by the nature of the substituents).
1893Jrnl. Chem. Soc. LXIV. i. 330 The hydrazo⁓compound..undergoes molecular change yielding two compounds, derivatives of ortho- and of para-amido⁓diphenylamine. It is proposed to call this reaction the semidine reaction, and to designate the orthamido⁓diphenylamine bases thus obtained by the name orthosemidines; the paramidodiphenylamine bases by the name parasemidines. 1898Ibid. LXXIV. i. 441 Only 50 per cent. of the total semidines obtained. 1938A. J. Mee tr. P. Karrer's Org. Chem. xxxiv. 498 If a para-position in hydrazobenzene is already occupied by a substituent, there are still further possibilities of isomerization. In addition to a diphenyline base and benzidine compounds.., two diphenylamine derivatives are formed in which only one of the benzene nuclei has rotated, the so-called p-semidine and o-semidine bases. The transformation is known as the semidine transformation. 1959E. S. Gould Mech. & Structure in Org. Chem. xv. 658 The rearrangements of hydrazobenzenes to benzidines, to diphenylenes, and to o-semidines are third-order reactions, first order in substrate and second order in hydrogen ion. 1975R. F. Brown Org. Chem. xxii. 772 A small amount of o shift occurs anyway, as well as a halfway shift to give semidines. |
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11：
相关热词搜索：semidine英英词典英英释义英语词汇意思用法释义英语
字词 最小距离分类程序 释义 【计】 minimum distance classifier 汉译英翻译词典收录405719条......
单词 semi-det 释义 semi-det, n.|smdt|Short for semi-detached house.1960J. Stroud Shorn Lam......
单词 semidiameter 释义 semidiameter[late L. (Boethius): see semi- 7 b.]The half of a diame......
单词 semi-diurnal 释义 semi-diurnal, a.[semi- 6 a.]1. Astron. Pertaining to, consisting of......
字词 暗堡 释义 bunker 汉译英翻译词典收录405719条汉英翻译词条，基本涵盖了全部常用中文字词......
单词 semi-direct 释义 semi-direct, a.[semi- 1 a.]Not wholly direct; spec. (of lighting) so......