Homologues of retinoic acid are converted by acid-catalysed cyclization into hydrindene compounds bearing a non-conjugated (αβ-saturated) enoic acid (or lactone) side-chain. Explanations are given for the colour reaction including structural elucidation of the quenched products and their mechanism of formation.
K. Tsukida, M. Ito, F. Tomeoka and A. Kodama, J. Chem. Soc., Perkin Trans. 1, 1981, 2472 DOI: 10.1039/P19810002472
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