The structure of kitol (5), a natural retinol dimer, has been determined. Kitol was converted into a perhydro-cis-γ-lactone (20), suggesting cis-orientation of its two hydroxymethyl groups. Three model compounds were obtained by the Diels–Alder reaction of retinol acetate with methyl trans-β-formylcrotonate (9).
B. V. Burger and C. F. Garbers, J. Chem. Soc., Perkin Trans. 1, 1973, 590 DOI: 10.1039/P19730000590
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