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
随便看	calling out calling the shots calling the shots (of) calling the shots of calling the tune calling the tune (for) calling the tune for calling to account calling up callings Callionymidae callionymidaes calliope calliopean calliopes calliophes calliophises calliophisses calliopsis calliopsises callipash callipees Callipepla calliper callipered

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