怎样把纽曼投影式转换为费歇尔投影式?

2025-03-16 17:07:27
推荐回答(1个)
回答1:

纽曼投影式改为费歇尔投影式的操作流程图如下:

在纽曼投影式中,前后基团也可认为都不在投影的“理想”位置(此时,碳链一定在竖线上,投影角度一定是在正上方,以下同),可以用3种方法解决,如图16所示。第1种方法,圆圈前面的3个基团不动,只旋转背面的3个基团,使其成全重叠式。再在纸面内旋转整个式子,使其处于“理想”投影状态后去投影。第2种方法,圆圈前后基团分步操作,变成“理想”的全重叠纽曼投影式,再去投影。第3种方法,保持圆圈前的3个基团不动,背面3个基团顺时针旋转60°,变成全重叠纽曼投影式,可改变观察方向,如倒着向上看,直接投影。

纽曼投影式改为费歇尔投影式的操作流程图

如图所示,可以有2种途径解决问题:第1种途径由楔形式改成锯架式,再投影成费歇尔投影式。此种途径又可以有2种方法,一是在楔形式上改成全重叠式后再转为锯架式(方法1a), 二是将楔形式直接改成锯架式后,再在锯架式上改成全重叠式(方法1b)。第2种途径是不经过改锯架式,将楔型式改成全重叠式后直接投影,如方法2所示。

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