C2H4O
Aldehyde Al"de*hyde ([a^]l"d[-e]*h[imac]d), n. [Abbrev. fr. alcohol dehydrogenatum, alcohol deprived of its hydrogen.] 1. (Chem.) A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation. [1913 Webster]

2. (Chem.) Any compound having the group {-CHO}. Methyl aldehyde, the simplest aldehyde, is more commonly called formaldehyde, {H-CHO}, and acetic aldehyde is now more commonly called {acetaldehyde}. The higher aldehydes may be solids. A {reducing sugar} typically contains the aldehyde group. [PJC]

Note: The aldehydes are intermediate between the alcohols and acids, and differ from the alcohols in having two less hydrogen atoms in the molecule, as common aldehyde (called also {acetaldehyde}, {acetic aldehyde} or {ethyl aldehyde}), {C2H4O}; methyl aldehyde (called also {formaldehyde}), {CH2O}. [1913 Webster +PJC]

{Aldehyde ammonia} (Chem.), a compound formed by the union of aldehyde with ammonia. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Aldehȳd — (Acetaldehyd, Äthylaldehyd, Äthylidenoxyd, Äthanal) C2H4O oder CH3.CHO, findet sich im Vorlauf von der Spiritusrektifikation, in den Destillationsprodukten der vergornen Runkelrübenmelasse, auch im Wein und Obstwein, entsteht bei Oxydation von… …   Meyers Großes Konversations-Lexikon

  • Polymerisation — (griech.), die Verkettung mehrerer Moleküle eines Körpers zu einem größern Molekül eines neuen Körpers. Solcher P. unterliegen z. B. Olefine bei Einwirkung geringer Mengen von verdünnter Schwefelsäure, Chlorzink, Fluorbor etc., aus Isobutylen… …   Meyers Großes Konversations-Lexikon

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