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diketene

n. (context organic compound English) The acetyl ketene CH₃CO-CH=C=O

Wikipedia

Diketene

Diketene is an organic compound with the formula (CHCO). It is formed by dimerization of ketene (IUPAC name: ethenone). Diketene is a member of the oxetane family. It is used as a reagent in organic chemistry. It is a colorless liquid.