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1 The compound CH2=C=O (ethenone). It can be prepared by pyrolysis of propanone. The compound reacts readily with compounds containing hydroxyl or amino groups and is used as an acetylating agent.

2 Any of a class of compounds of the type R1R2=C=O, where R1 and R2 are organic groups. Ketenes are reactive compounds and are often generated in a reaction medium for organic synthesis.

http://www.acdlabs.com/iupac/nomenclature/93/r9458.htm Information about IUPAC nomenclature

Subjects: Chemistry.

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