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.

本文还用此观点讨论了一些单质和化合物的酸碱性质。

The acidic-basic properties of simple substances and compounds are discussed from this viewpoint.

以单质碘为催化剂，通过丁醛和乙二醇反应合成了丁醛乙二醇缩醛。

Butyraldehyde glycol acetal was synthesized from butyraldehyde and glycol by using iodine as catalyst.

单质分子和氮化物与卤化物，其核间距与力常数都表现有相似的行为。

The internuclear distances and force constants of the elementary molecules as well as of the nitrides and halides, exhibit a similar behavior.

单质碳第三种同素异形体——富勒烯及其化合物的出现，已引起化学界的极大关注。

The turning-up of Fullerene and its Compounds, the third kind of allotrope of carbon in simple substance, has been taken a great interest in in chemical circles.