关于有机化学课程中乙烯、乙炔球棍模型的一点探讨

A Discussion about the Ball - and - stick Models of Ethane and Ethyne in Organic Chemistry

乙烯、乙炔分子球棍模型在有机化学课程教学过程中广泛使用,但是目前广泛使用的乙烯、乙炔分子球棍模型容易引起学生的一些误会,建议在乙烯、乙炔分子球棍模型中,弧形弯曲连接杆表示π键,用直线连接杆表示δ键,这样既有效的区分出了π键、δ键类型的不同;通过弧形弯曲连接杆比直线连接杆长,也形象地表示出了π键没有δ键稳定,π键易断裂,发生加成反应这一实验事实。

The ball - and - stick models of ethane and ethyne were widely used in the teaching process at Organic Chemistry classes, but the models which used presently often led some misleading to students. A discussion about the models was proposed. An advice of showing δbonding with straight stick, showing π bonding with half - moon bend stick was proposed to make a distinction of them. By the image of the half - moon bend stick was longer than straight stick, it can be express vividly that π bonding was less strong than δ bonding, and π bonding was break easily, then an addition reaction was occurred.