Four crystalline vitamin A 2 isomers, i.e. all‐ trans , 13‐ cis , 9‐ cis , and 9,13‐di‐ cis , as well as the corresponding acids and aldehydes, have been prepared from cis ‐ and trans ‐dehydro‐β‐ionylideneacetaldehyde.
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Schwieter et al. (1962) studied this question.
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