Jisho

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Wikipedia definition
1. DiketeneDiketene is an organic compound formed by dimerization of ethenone (ketene). Diketene is a member of the oxetane family. It is used as a chemical reagent in organic chemistry. It is a colorless liquid and heating regenerates the ketene monomer. Alkylated ketenes also dimerize with ease and form substituted diketenes. Diketene readily hydrolyses in water forming acetoacetic acid, its half-life in pure water is approximately 45 minutes a 25 °C at 2Read “Diketene” on English Wikipedia
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