| 释义 |
quinoid, a. and n. Chem.|ˈkwɪnɔɪd|
[f. quinone + -oid.]
A. adj. = quinonoid a.
B. n. A quinonoid compound.
1900E. F. Smith tr. V. von Richter's Org. Chem. (ed. 3) II. 364 The colored alkali salts are quinoïd derivatives of phenolphthaleïn. 1907Chem. Abstr. I. 300 (heading) Oxidation of benzidine. (VIII Communication on quinoids.) 1908Ibid. II. 827 The quinoid theory of colour. 1938G. H. Richter Textbk. Org. Chem. xxx. 627 The ortho and para quinoid structures show strong chromophoric properties. 1949English & Cassidy Princ. Org. Chem. xx. 396 It is thought that some metabolic processes involve a reduction-oxidation system involving quinoid and hydroquinoid molecules. 1961B. J. Stokes Org. Chem. xxiv. 437 Addition of alkali to phenolphthalein causes a change in structure and a molecule containing a quinoid ring is made. 1975Lewis & Peters Facts & Theories Aromaticity v. 76 The quinones and quinoids generally are usually thought to be non-aromatic yet they apparently contain the magic 6π-electrons in a ring, an electron arrangement which is often regarded as characteristic of aromaticity.
Hence quiˈnoidal a.
1907Chem. Abstr. I. 302 The presence of methylene destroys the ability of the two phenyl groups to assume the quinoidal state. 1975Nature 20 Feb. 625/1 Its infrared spectrum in CHCl3 further substantiates a quinoidal structure, showing a strong carbonyl absorption at 1,654 cm-1 and an olefinic absorption at 1,584 cm-1. |