Indolizinium salts indolizines

Indolizine and its simple alkyl derivatives are sensitive to light and to aerial oxidation, which lead to destruction of the ring system. Catalytic reduction in acidic solution (reduction of the indolizinium cation) selectively saturates the pyrrole ring, giving a pyridinium salt complete saturation, affording indolizidines, results from reductions over platinum. ... 

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