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Oxidation and Degradation Products of Papaverine, Part II[1]: Investigations on the Photochemical Degradation of Papaverine Solutions

The structure of the final degradation product formed in papaverine solutions in either water or chloroform was found to be a 2, 3, 9, 10‐tetramethoxy‐12‐oxo‐12H‐indolo [2, 1‐a] isoquinolinylium salt (a dibenzo [b, g] pyrrocolonium derivative). Its formation from papaverine oxidation products that is papaverinol, papaveraldine, and papaverine‐N‐oxide chloroformsolutions under the influence of UV light, was investigated and possible reaction pathways are discussed.