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Quinonoid Sentence Examples

  • It follows on this theory that all coloured substances contain either of the groupings or the former being a para-quinonoid, the latter an ortho-quinonoid.
  • The quinonoid structure of many coloured compounds has been proved experimentally, as, for example, by Hewitt for the benzene-azo-phenols, and Hantzsch for triaminotriphenyl methane and acridine derivatives; but, at the same time, many substances cannot be so explained.
  • Solution in dilute alkali was supposed to be accompanied by the rupture of the lactone ring with the formation of the quinonoid salt shown in 2.
  • He has also shown that the nitrophenols yield, in addition to the colourless true nitrophenol ethers, an isomeric series of coloured unstable quinonoid aci-ethers, which have practically the same colour and yield the same absorption spectra as the coloured metallic salts.
  • Meyer) regards all coloured substances as having a quinonoid structure.
  • This oscillation may be represented in the case of acridine and fluorescein as This theory brings the property of fluorescence into relation with that of colour; the forms which cause fluorescence being the coloured modifications: ortho-quinonoid in the case of acridine, paraquinonoid in the case of fluorescein.
  • The constitution of the oxyazo compounds has attracted much attention, some chemists holding that they are true azophenols of the type R N 2 R l OH, while others look upon them as having a quinonoid structure, i.e.
  • Hewitt has also attacked the problem by brominating the oxyazobenzenes, and has shown that when the hydrobromic acid produced in the reaction is allowed to remain in the system, a brombenzene-azo-phenol is formed, whilst if it be removed (by the addition of sodium acetate) bromination takes place in the phenolic nucleus; consequently the presence of the mineral acid gives the azo compound a pseudo-quinonoid character, which it does not possess if the mineral acid be removed from the sphere of the reaction.
  • Soc., 1907, 91, p. 1049) suggested a quinonoid formula for diazonium salts, which has been combated by Hantzsch (Ber., 1908, 41, pp. 353 2 et seq.).
  • It appears probable that the solutions contain a quinonoid modification (ssee Gomberg and Cone, Ann., 1909, 37 0, p. 142).
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Also Mentioned In


  • quinarene
  • electron-carrier
  • quinoid
  • quinone

    WORDS NEAR quinonoid IN THE DICTIONARY


    • quinoneoximes
    • quinones
    • quinonimine
    • quinonimines
    • quinonoid
    • quinonoxime
    • quinonoximes
    • quinoprotein
    • quinoproteins
    • quinotolast
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