Cathodic reduction of pyridines

Selective cathodic reduction of pyridines is a process of great industrial significanee [171]. As an example, dimethyl pyridinedicarboxylates undergo a highly selective electroreduction in methanol by use of a divided cell. The product obtained depends on the position of the substituents. Thus, the 2,3- and 2,5-dicarboxylates give the 1,2-dihydropyridines whereas the 2,6-, 3,4- and 2,4-dicarboxylates the 1,4-dihydropyridines [172]. Many other ring reductions of azines (often with dimerization as a side-reaction, see Section 6.4.3) are discussed in electrochemistry texts and reviews [116]. Attempts have been made to rationalize the herbicidal properties of dipyridinium salts in terms of their cathodic behavior [173]. 

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See also in sourсe #XX -- [ , ]

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