Abstract
The anodic oxidation of fifteen 1,4-dihydropyridines in acetonitrile was investigated by electrogenerated chemiluminescence measurements at a rotating platinum disc electrode in the presence of some luminescent compounds D. The emission observed originates from the homogeneous electron transfer between the cation radicals of D and the free pyridiniumyl radicals formed in the dihydropyridine oxidation. It follows from the luminescence-potential curves that, in addition to the pyridiniumyl radicals, the dihydropyrindine cation radicals are also involved in the dehydrogenation process. Therefore, from the different oxidation pathways of dihydropyridines described in the literature an ECE mechanism is preferred in acetonitrile. The substituent effect on the oxidation reaction and on the anodic luminescence is discussed.
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