In the reactions of 2,4-dinitro- and 2,4,5-trinitro-1-(1-piperidyl)naphthalenes with piperidine in dimethyl sulfoxide, the 1,1-disubstituted anionic σ complex was confirmed to exist with visible absorption and NMR spectra. Especially in the latter case the 1,3-disubstituted anionic σ complex was formed, the cause of formation of which was ascribed to the deactivating effect of 1-piperidyl group on
在
二甲基亚砜中 2,4-二硝基和 2,4,5-三硝基-1-(1-
哌啶基)
萘与
哌啶的反应中,证实存在 1,1-二取代阴离子 σ 络合物,具有可见吸收和核磁共振谱。特别是在后一种情况下,形成了 1,3-二取代阴离子 σ 络合物,其形成原因归因于 1-
哌啶基对
萘环 C1 位的失活作用和 1-
哌啶基的空间效应
哌啶在 C1 位的亲核攻击组。这些因素使 1,1-二取代阴离子复合物不稳定。