单词	Knoevenagel reaction
释义	Knoevenagel reaction noun Knoe·​ve·​na·​gel reaction kəˈnə(r)vəˌnāgəl-, kəˈnə̄v- variants or Knoevenagel condensation : an aldol-type condensation catalyzed by amines that takes place between an aldehyde or ketone and a compound containing an active methylene group (as in esters of acetoacetic acid, malonic acid, or cyanoacetic acid) Word History Etymology after Emil Knoevenagel †1921 German chemist
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