Ketene definitions

kē'tēn'
A pungent, toxic, colorless gas, C2 H2 O, used chiefly as an acetylation agent.
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A colorless, toxic gas, H2C∶CO, with a penetrating odor, made by passing acetone or acetic acid through hot metal tubes: used esp. as an acetylating agent.
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Any of a series of related organic compounds containing the C∶CO group.
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(organic chemistry) Any of a class of unsaturated ketones, having a general formula R1R2C=C=O, that react as if they were inner acid anhydrides.
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(organic chemistry) The parent compound of this class, CH2=C=O, an unstable, reactive colourless gas.
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Sentence Examples

  • Two classes may be distinguished: the aldo-ketenes, including ketene itself, together with its monoalkyl derivatives and carbon suboxide, and the keto-ketenes which comprise the dialkyl ketenes.

  • The ketoketenes are coloured compounds, which undergo autoxidation readily, form ketene bases on the addition of pyridine and quinoline, and yield addition compounds with substances containing the C:N and C:0 groupings.

  • Ketene, CH, :CO, was discovered by N.

  • Dimethyli ketene, (CH3)2C :CO, obtained by the action of zinc on a-brom-isobutyryl bromide, is a yellowish coloured liquid.

  • Diethyl ketene, (C2H5)2C :CO, is formed on heating diethylmalonic anhydride (Staudinger, ibid.).

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Words near ketene in the Dictionary