The electrochemical and chemical properties of the title compounds 1 have been investigated. It was shown that either anodic electron transfer or lithium cation electrophilic assistance may induce elimination and therefore yield relevant vinylic compounds. Under such conditions, when conducted in the presence of a lithium salt, the anodic polymerization may occur either on 1 (and yield afterward to elimination at the oligomer state) or on the vinylic products. Similar conclusions may appear from 1 radical cations which can afford elimination reactions.