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Schiff bases were prepared from all‐trans‐retinal (I) and pyrrolidine perchlorate (II) and from I and n‐butyl amine, protonated with anhydrous hydrogen chloride gas, Ill. Initial quantum yields of trans→ cis photoisomerization (Φ°PI) were determined and primary photoproducts and product ratios were measured in aerated methanol. Φ°PI of all‐trans‐III is independent of excitation energy. All analyses were made using high‐pressure liquid chromatographic (LC) methods. It was necessary to hydrolize the Schiff bases to corresponding retinals prior to LC analysis.
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Donahue et al. (1984) studied this question.
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