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芴为非交替芳烃,它的顺磁共振谱研究不如联苯、稠环等交替芳烃来得成熟,而且由于休格尔(Huckel)分子轨道法对非交替芳烃离子基的电子前线密度值计算有所限制,解释波谱也受到影响。关于芴负离子基的顺磁共振谱研究,曾由Fraenkel等用电极还原法进行了试探,结果芴受阳极氧化而变为芴酮负离子基。这一研究的负结果,说明了芴的中央五元环所具(?)CH_2是较活泼的,但其电子本性如何,有否超共轭效应,值得进一步用顺磁
Fluorene is a non-alternating aromatic hydrocarbon whose paramagnetic resonance spectrum is not as mature as alternative aromatic hydrocarbons such as biphenyls and condensed rings. Moreover, due to the Huckel molecular orbital method, the electronic front line densities of non-alternating aromatic hydrocarbon radicals are calculated Limit, explain the spectrum is also affected. The paramagnetic resonance spectrum of the fluorene anion group has been tentatively studied by the method of electrode reduction by Fraenkel et al. As a result, fluorene is anodized to become a fluorenone anion group. The negative result of this study shows that the central five-membered ring of fluorene is more active. However, its electronic nature and superconjugation effect deserve to be further studied.