Various eliminationreactions which are believed to proceed with E2-type mechanisms have been examined on 9-[2-(1,2-dibromoethyl)-1-naphthyl]fluorene and 9-[2-(1-hydroxy-2-trimethylsilylethyl)-1-naphthyl]fluorene rotamers. Generally, the reaction of the sp rotamers was faster than that of the ap by a factor of 2–9. The results are attributed to the steric effects that are operative in the ap form.
已对 9-[2-(1,2-二溴乙基)-1-萘基]芴和 9-[2-(1-羟基-2-三甲基甲硅烷基乙基) -1-萘基]芴旋转异构体。通常,sp 旋转异构体的反应比 ap 快 2-9 倍。结果归因于以 ap 形式起作用的空间效应。