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...
Impure novels have brought and are bringing much misery on the world.不洁的小说已经给世界带来不幸,还将带来更多的不幸.The air of a big city is often impure.大城市的空气往往是污浊的.You've got a dirty mind , ie You have impure thoughts.你满脑子下流事....