Abstract— –From the A‐dihydrobilindione 3. the pyridinium derivatives 6a, b and analogues therwf have been obtained by a formal nucleophilic substitution. The reaction is rationalized as a photochemically assisted oxidation of 3 with a subsequent regioselective addition of pyridine at C‐5. By thermolysis. 6a.b yields back the parent bilin 3, together with an oxidation product. The significance of the reaction with respect to the phytochrome interconversion is discussed.
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Krauss et al. (1979) studied this question.
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