The pyridyl radical generated chemically or electrochemically by the le-reduction of 1-benzyl-3-carbamoylpyridinium undergoes dimerization to give mainly four dimers, diastereomers of 4,4′- and 4,6′-linked dimers. Isomerization between the dimers proceeds readily.
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Ohnishi et al. (1979) studied this question.
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