The reaction of o-iodobenzoic acid with various acetylenic compounds in the presence of a palladium catalyst leads to phthalides [1-(3H)isobenzofuran-3-ones] as major products and isocoumarins as minor products.
N. G. Kundu and M. Pal, J. Chem. Soc., Chem. Commun., 1993, 86 DOI: 10.1039/C39930000086
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