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  • Title: Synthesis of chromones via palladium-catalyzed ligand-free cyclocarbonylation of o-iodophenols with terminal acetylenes in phosphonium salt ionic liquids.
    Author: Yang Q, Alper H.
    Journal: J Org Chem; 2010 Feb 05; 75(3):948-50. PubMed ID: 20067278.
    Abstract:
    The highly efficient and selective palladium-catalyzed ligand-free cyclocarbonylation reaction of o-iodophenols with terminal acetylenes and CO in the phosphonium salt ionic liquid, C(14)H(29)(C(6)H(13))(3)P(+)Br(-), affords diversified chromones in good to excellent yields under atmospheric CO pressure. The ionic liquid, as the reaction medium, enhances the efficiency of the cyclocarbonylation reaction.
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