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实验室中制备环戊二烯,一般是在回流装置下,利用油浴加热到170℃以上使环戊二烯二聚体解聚,同时在接收瓶中加入无水氯化钙,并用冰水冷却之。但这种方法往往产率不高。文献[2]模仿工业生产上的气相裂解法对此作了改进,即在环戊二烯二聚体的热面（170℃）上,垂直按装一只电热赤棒（electri-
Cyclopentadiene was prepared in the laboratory, typically under reflux, with the aid of an oil bath heated above 170 ° C to depolymerize the cyclopentadiene dimer while adding anhydrous calcium chloride to the receiver and ice-cold Cool it. However, this method is often not productive. Literature [2] imitates the industrial production of the gas-phase cracking method to improve this, that is, in the hot side of the cyclopentadiene dimer (170 ℃), mounted vertically by an electrothermal red rod (electri-