oxindolen.
/ɒkˈsɪndəʊl/, U.S. /ɑkˈsɪnˌdoʊl/ Chemistry.
A colourless crystalline compound, C8H7NO, having a structure similar to indole, with an oxygen atom attached to the pyrrole ring.
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oxindole1872
1872 H. Watts Dict. Chem. VI. 736 The oxindol..forms long colourless needles or feathery groups,..and at higher temperatures distils..as a colourless or reddish oil which immediately solidifies in the crystalline form.
1881 Nature 7 July 229/1 A body called oxindol, from which isatin, and therefore indigo, can be obtained.
1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xxxv. 551 It [sc. indole] is obtained by distilling oxindole with zinc dust.
1967 I. L. Finar Org. Chem. (ed. 5) I. xxx. 799 There are three possible formulæ for oxindole.
2001 Macromolecules 34 1122 The positive charge associated with a protonated oxindole residue would inhibit further substitution of the alkylated rings.
This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022).
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