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  • Title: Lewis acid catalyzed reaction of arylvinylidenecyclopropanes with acetals: a facile synthetic protocol for the preparation of indene derivatives.
    Author: Lu JM, Shi M.
    Journal: Org Lett; 2006 Nov 09; 8(23):5317-20. PubMed ID: 17078707.
    Abstract:
    [Structure: see text] A number of highly substituted indene derivatives have been prepared in good yields by the reactions of arylvinylidenecyclopropanes 1 with acetals 2 in the presence of Lewis acid under mild conditions. The reaction is believed to proceed via regioselective addition of oxonium intermediate to arylvinylidenecyclopropane and the subsequent intramolecular Friedel-Crafts reaction.
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