Abstract
The title compound35 was prepared by catalytic reduction of the diones29 a and11a.29 a was synthesized by systematic anellation of fivemembered rings to the positions 5,6 and 5′,6′, resp., of 2,2′-spirobiindane. The preparation of11 a was achieved byFriedel-Crafts cyclisation of bis-(5-indanylmethyl)-malonic acid.
s-Hydrindacene-1-one5 a was prepared as a precursor for the synthesis of11 a (see forthcoming publication) and its derivates as models for corresponding anellation and substitution reactions.
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Neudeck, H.K. Aromatische Spirane, 14. Mitt. Darstellung von 2,2′-Spirobi-(s-hydrindacen) und seinen Vorstufen. Monatsh Chem 118, 627–657 (1987). https://doi.org/10.1007/BF00809674
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DOI: https://doi.org/10.1007/BF00809674