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The course of electrochemical and chemical oxidation of quaternized pyridyl dihydropyridines has been compared. The splitting off of the carboxylato group from the betaine structure as the substituent in position 4 of 1,4-dihydropyridine ring seems to be the decisive factor in the intramolecular cycloaddition forming indolizines during oxidation. The mechanisms of the electrochemical oxidation in...
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