All‐trans‐5‐demethylretinal and its 5‐2H, 7‐2H and 5,7‐2H2 isotopomers have been synthesized by means of a new and simple scheme. Using photochemistry, the 9‐, 11‐ and 13‐cis, as well as the 9,13‐ and 11,13‐di‐cis isomers, were obtained. The structures were established by means of 1H NMR spectroscopy.
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Spijker‐Assink et al. (1988) studied this question.
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