The behavior of forming and cracking of carbenium ions was analyzed and the reaction pathway of propylene formation was summarized.

通分析正碳离子的成与裂解特点，探讨了丙烯的成规律。

Carbenium ion is an active intermediate state in organic reactions,which has been investigated for over 100 years.

正碳离子是有机化学程一种活泼的间体,对于它的研究已经有100多年的历史。