其金属取代物能和环戊酮顺利地反应得到40.Its metallation and addition to cyclopentanone proceeded well to 40.以单质碘为催化剂合成了环戊酮乙二缩酮.Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.比较研究了三种含苄叉环戊酮基团的新型香豆素类光敏染料.Absorption spect...
The emptiness here sent shivers down my spine.这里的空寂让我脊梁骨发凉。The accident gave me the shivers.这事故使我不寒而栗.The shriek sent shivers ( up and ) down my spine.那尖叫声使我的背脊起了一阵寒 颤....