diketene

例句：

1. 1.The reaction of diketene with water produces carbon dioxide gas.
   二烯酮与水的反应产生二氧化碳气体。
2. 2.This compound is a key intermediate in the synthesis of many organic compounds.
   这种化合物是合成许多有机化合物的关键中间体。
3. 3. The structure of diketene is similar to that of acetylene.
   二烯酮的结构与乙炔相似。